I haven't really made the time to look through this more thoroughly, but:
http://mocap.cs.cmu.edu/
Found this linked on moddb, it's a database of free motion caps that you can plug in fairly easily, apparently. It's pretty big, with tons of variation. They offer a tool to view the animations too, it looks like. I'm pretty excited to try some of these out!
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The guys on wolfire are already tested some animations on their engine :
[ame]
http://blog.wolfire.com/2010/07/Initial-motion-capture-tests
That's awesome to have mocap for free !
I think working with these animations in conjunction with Endorphin would certainly make these more useful, for blending into idle anims and such. I'll need to give these a try.
http://wiki.polycount.com/CategoryAnimation#Motion_Capture
Go wiki go!