I don't know if anyone's tried to compile a list. I have noticed, however, that a few of the webfic things I've read have TV Tropes pages, and they're fun to go through.
I'm pleased that there's one for One of Pay Me, Bug!:
Here's one for Worm:
The Legion of Nothing:
Tales of MU:
MCA Hogarth has a slew of them...
Spots the Space Marine:
Flight of the Godkin Griffin:
Those are the ones I found with a quick search.