It seems to go here...

Refresh your memory.

http://www.youtube.com/watch?v=0CuGbxYXmm8&feature=related

Be it in the baseline Capcom games, messed up conversions like Koryu, or MUGEN itself, there's a lot of stuff from here that actually exists.

It's not Ken, but Ryu, but 9hit+ Hurricane Kick.
Enemy throws you?  Cancel it into a special.
Homing Hadoken?
That initial long flip is what Chun Li does for victory in MVC3.
Cancel Spinning Bird into a kick.

I just thought it was interesting, is all.