I have converted the Dude from the Microsoft XNA Skinning Sample in to Blender format. The transfer is not ideal but is enough to provide a starting point.
Dude in Blender
I have added an armature (bones) for animation and a test action called 'Walk'. This is for my own purposes but may be useful to others. It gives an idea of scale and a suitable mesh quality for use in games. Please note that my test animation is very poor.
Dude for Blender (9.5Mb) March 2009 (Imperial scale)
Test Dude Animations (8.5Mb) November 2010 (Metric scale)