I'll happily take on copyediting requests (just ask!) – I especially enjoy fixing up articles written by non-native English speakers. I'm fluent in Russian and Ukrainian, so I also try to watch Wikipedia:Pages needing translation into English for any Slavic-related material that needs improvement.
Otherwise, you'll find me spiffying up random articles, helping newbies, and occasionally creating articles on various and sundry topics I happen to know something about. I get enough politics during my day job, so I try to avoid arguing about anything in my volunteer editing time :)
Stuff I've done (that you can help improve!)