Err, no. Google Summer of Code isn't really an internship. You just develop for the project on something you're interested in (and your mentor approves), and you and the mentoring project get paid in chunks over the summer (by Google).
Google Summer of Code is a global program that offers student developers stipends to write code for various open source software projects. There's 175 participating organizations, one of which is Mono, which has been a part of it since the very first year. I know it's a fad to not RTFA, but really, it's not that complicated :)