2.50:

svn merge https://svn.blender.org/svnroot/bf-blender/trunk/blender -r19820:HEAD

Notes:
* Game and sequencer RNA, and sequencer header are now out of date
  a bit after changes in trunk.
* I didn't know how to port these bugfixes, most likely they are
  not needed anymore.
  * Fix "duplicate strip" always increase the user count for ipo.
  * IPO pinning on sequencer strips was lost during Undo.

release/scripts/mesh_mirror_tool.py

@@ -3,7 +3,7 @@
 Name: 'Mirror Vertex Locations & Weight'
 Blender: 241
 Group: 'Mesh'
-Tooltip: 'Snap Verticies to X mirrord locations and weights.'
+Tooltip: 'Snap Verticies to X mirrored locations and weights.'
 """
 
 __author__ = "Campbell Barton aka ideasman42"
@@ -11,11 +11,11 @@ __url__ = ["www.blender.org", "blenderartists.org", "www.python.org"]
 __version__= '1.0'
 __bpydoc__= '''\
 This script is used to mirror vertex locations and weights
-It is usefull if you have a model that was made symetrical
+It is useful if you have a model that was made symmetrical
 but has verts that have moved from their mirrored locations slightly,
-casuing blenders X-Mirror options not to work.
+causing blenders X-Mirror options not to work.
 
-Weights can be mirrored too, this is usefull if you want to model 1 side of a mesh, copy the mesh and flip it.
+Weights can be mirrored too, this is useful if you want to model 1 side of a mesh, copy the mesh and flip it.
 You can then use this script to mirror to the copy, even creating new flipped vertex groups, renaming group name left to right or .L to .R
 
 Vertex positions are mirrored by doing a locational lookup,