Ask HN: Best summer jobs for a computer science student?

I didn't get in to Google Summer of Code so I need to find other ways to make money over the summer. I would love to do something related to programming but still am only in my fourth quarter as a computer science major. I know a little Visual Basic, a little Python, and a fair amount of Java (currently taking the third Java class in my curriculum). Would it be possible for me to find an actual short-term programming job at my skill level? Should I just check Craigslist "gigs" to see if there are projects I can complete? Should I solicit companies to see if they'd have a position for me? I've always had really good relationships with previous bosses so I could probably talk to my previous companies for work in IT but I don't really know much about sysadmin stuff and that area doesn't interest me.