Talk to us grad students! We get a huge amount of useful emails through our university Listserv. I think I have seen at least a half dozen emails asking for people to do editorial work for articles to be published. Heck, I got a few I need reviewed myself. People visiting from countries outside the English-speaking world almost always seek out editors. Most university presses are student-run. But look for something at the Writing Center – they tend to hire new people every few years.