diff --git a/applications/osgarchive/osgarchive.cpp b/applications/osgarchive/osgarchive.cpp
index 91e8068f0..64b51057c 100644
--- a/applications/osgarchive/osgarchive.cpp
+++ b/applications/osgarchive/osgarchive.cpp
@@ -29,7 +29,7 @@ int main( int argc, char **argv )
     
     // set up the usage document, in case we need to print out how to use this program.
     arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
-    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is an application for collecting a set of seperate files into a single archive file that can be later read in OSG applications..");
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is an application for collecting a set of separate files into a single archive file that can be later read in OSG applications..");
     arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
         
     // if user request help write it out to cout.
diff --git a/applications/osgfilecache/osgfilecache.cpp b/applications/osgfilecache/osgfilecache.cpp
index 0c42a7e05..95e151bea 100644
--- a/applications/osgfilecache/osgfilecache.cpp
+++ b/applications/osgfilecache/osgfilecache.cpp
@@ -451,7 +451,7 @@ int main( int argc, char **argv )
     
     // set up the usage document, in case we need to print out how to use this program.
     arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
-    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is an application for collecting a set of seperate files into a single archive file that can be later read in OSG applications..");
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is an application for collecting a set of separate files into a single archive file that can be later read in OSG applications..");
     arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
     arguments.getApplicationUsage()->addCommandLineOption("-l level","Read down to level across the whole database.");
     arguments.getApplicationUsage()->addCommandLineOption("-e level minX minY maxX maxY","Read down to <level> across the extents minX, minY to maxY, maxY.  Note, for geocentric datase X and Y are longitude and latitude respectively.");
diff --git a/applications/present3D/Cluster.cpp b/applications/present3D/Cluster.cpp
index 1792a25af..1b746a167 100644
--- a/applications/present3D/Cluster.cpp
+++ b/applications/present3D/Cluster.cpp
@@ -240,7 +240,7 @@ void CameraPacket::readEventQueue(osgViewer::Viewer& viewer)
 
 void CameraPacket::writeEventQueue(osgViewer::Viewer& viewer)
 {
-    osg::notify(osg::INFO)<<"recieved events = "<<_events.size()<<std::endl;
+    osg::notify(osg::INFO)<<"received events = "<<_events.size()<<std::endl;
 
     // copy the events to osgProducer style events.
     viewer.getEventQueue()->appendEvents(_events);
diff --git a/examples/osganalysis/osganalysis.cpp b/examples/osganalysis/osganalysis.cpp
index 1fdf20365..551712a31 100644
--- a/examples/osganalysis/osganalysis.cpp
+++ b/examples/osganalysis/osganalysis.cpp
@@ -134,11 +134,11 @@ public:
 
         if (_imageProcessor.valid())
         {
-            OSG_NOTICE<<"Will be using ImageProcessor to proces image "<<image->getFileName()<<std::endl;
+            OSG_NOTICE<<"Will be using ImageProcessor to process image "<<image->getFileName()<<std::endl;
         }
         else
         {
-            OSG_NOTICE<<"No ImageProcessor to proces image "<<image->getFileName()<<std::endl;
+            OSG_NOTICE<<"No ImageProcessor to process image "<<image->getFileName()<<std::endl;
         }
             OSG_NOTICE<<"   compressImage "<<_compressImages<<std::endl;
             OSG_NOTICE<<"   generateMipmaps "<<_generateMipmaps<<std::endl;
diff --git a/examples/osgpagedlod/osgpagedlod.cpp b/examples/osgpagedlod/osgpagedlod.cpp
index 9bb0282df..646ae73bb 100644
--- a/examples/osgpagedlod/osgpagedlod.cpp
+++ b/examples/osgpagedlod/osgpagedlod.cpp
@@ -217,7 +217,7 @@ int main( int argc, char **argv )
     
     // set up the usage document, in case we need to print out how to use this program.
     arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
-    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" creates a hierachy of files for paging which can be later loaded by viewers.");
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" creates a hierarchy of files for paging which can be later loaded by viewers.");
     arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
     arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
     arguments.getApplicationUsage()->addCommandLineOption("-o","set the output file (defaults to output.ive)");
diff --git a/examples/osgparticleeffects/osgparticleeffects.cpp b/examples/osgparticleeffects/osgparticleeffects.cpp
index 121119766..f78f852e6 100644
--- a/examples/osgparticleeffects/osgparticleeffects.cpp
+++ b/examples/osgparticleeffects/osgparticleeffects.cpp
@@ -316,7 +316,7 @@ public:
             {
                 // insert particle effects alongside the hit node, therefore able to track that nodes movement,
                 // however, this does require us to insert the ParticleSystem itself into the root of the scene graph
-                // seperately from the the main particle effects group which contains the emitters and programs.
+                // separately from the the main particle effects group which contains the emitters and programs.
                 // the follow code block implements this, note the path for handling particle effects which arn't attached to 
                 // moving models is easy - just a single line of code!
             
diff --git a/examples/osgwidgetmenu/osgwidgetmenu.cpp b/examples/osgwidgetmenu/osgwidgetmenu.cpp
index b46023157..c4e943e84 100644
--- a/examples/osgwidgetmenu/osgwidgetmenu.cpp
+++ b/examples/osgwidgetmenu/osgwidgetmenu.cpp
@@ -112,7 +112,7 @@ int main(int argc, char** argv) {
 
     menu->addWidget(new ColorLabelMenu("Pick me!"));
     menu->addWidget(new ColorLabelMenu("No, wait, pick me!"));
-    menu->addWidget(new ColorLabelMenu("Dont pick them..."));
+    menu->addWidget(new ColorLabelMenu("Don't pick them..."));
     menu->addWidget(new ColorLabelMenu("Grarar!?!"));
 
     wm->addChild(menu);
diff --git a/src/osgPlugins/ogr/ReaderWriterOGR.cpp b/src/osgPlugins/ogr/ReaderWriterOGR.cpp
index f7003bd40..6380ad35a 100644
--- a/src/osgPlugins/ogr/ReaderWriterOGR.cpp
+++ b/src/osgPlugins/ogr/ReaderWriterOGR.cpp
@@ -102,7 +102,7 @@ public:
     {
         supportsExtension("ogr","OGR file reader");
         supportsOption("useRandomColorByFeature", "Assign a random color to each feature.");
-        supportsOption("addGroupPerFeature", "Places each feature in a seperate group.");
+        supportsOption("addGroupPerFeature", "Places each feature in a separate group.");
         oldHandler = CPLSetErrorHandler(CPLOSGErrorHandler);
     }
 
diff --git a/src/osgPlugins/quicktime/ReaderWriterQT.cpp b/src/osgPlugins/quicktime/ReaderWriterQT.cpp
index fd0be0be9..bf4b13a6a 100644
--- a/src/osgPlugins/quicktime/ReaderWriterQT.cpp
+++ b/src/osgPlugins/quicktime/ReaderWriterQT.cpp
@@ -326,7 +326,7 @@ public:
          
          // note from Robert Osfield when integrating, we should probably have so
          // error handling mechanism here.  Possibly move the load from
-         // the constructor to a seperate load method, and have a valid
+         // the constructor to a separate load method, and have a valid
          // state on the ImageStream... will integrated as is right now
          // to get things off the ground.
          QuicktimeImageStream* moov = new QuicktimeImageStream(fileName);
diff --git a/src/osgPlugins/stl/ReaderWriterSTL.cpp b/src/osgPlugins/stl/ReaderWriterSTL.cpp
index dca371c0f..1bbf793e8 100644
--- a/src/osgPlugins/stl/ReaderWriterSTL.cpp
+++ b/src/osgPlugins/stl/ReaderWriterSTL.cpp
@@ -88,7 +88,7 @@ private:
     {
       if (options && (options->getOptionString() == "separateFiles"))
       {
-        OSG_INFO << "ReaderWriterSTL::writeNode: Files are seperated written" << std::endl;
+        OSG_INFO << "ReaderWriterSTL::writeNode: Files are separated written" << std::endl;
       } else {
         m_f = new osgDB::ofstream(m_fout.c_str());        
         *m_f << "solid " << counter << std::endl;
diff --git a/src/osgPlugins/txp/trpage_header.cpp b/src/osgPlugins/txp/trpage_header.cpp
index deae87b95..a91b9ddd9 100644
--- a/src/osgPlugins/txp/trpage_header.cpp
+++ b/src/osgPlugins/txp/trpage_header.cpp
@@ -332,7 +332,7 @@ bool trpgHeader::Read(trpgReadBuffer &buf)
     return isValid();
 }
 
-// Read the LOD info (seperate token)
+// Read the LOD info (separate token)
 bool trpgHeader::ReadLodInfo(trpgReadBuffer &buf)
 {
     float64 range;