Is there a definitive list of things that work in bootcamp, but not parallels?

Reason I'm asking is that I just reorganised my hard disks and took out the bootcamp patition, and I'm not sure if I even need bootcamp.

The only reason I had it was that I couldn't get my sidewinder working on Parallels, but I just sorted that out. So right now I can't see any good reason to reinstall it.

What else doesn't work on Parallels?