Cyclopeatron's post about his GW game wherein he came up with mutation cards reminded me of this simple mutant character class I came up with a little while ago for S&W WB. I also cooked up some basic, but functional, mutation cards that can be used for the mutant class or used to spice up your monsters a bit.
I saved them as RTF files so that people could play around and modify them as they see fit.
Unfortunately, I don't have a group yet, so I haven't been able to play-test the class. However, for the most part the mutations are not nearly as gonzo as, say, Gamma World mutations, so I don't think they'd be too powerful.