Tim Boudreau had his first startup when he was 13, and has been hooked since, with brief departures to play rock and roll, write and play music and do graphics and photography. He is the coauthor of NetBeans, the Definitive Guide from O'Reilly and Associates. Tim was part of the team that open sourced NetBeans, Sun Microsystems' Java(tm) development environment, and currently work as a developer on that project. Originally from Massachusetts, he lives in his adopted home city, Prague, Czech Republic.
I took last week off to work on some Wicket web programming - seeing as my day-job is desktop programming (and also as a hedge against ending up jobless after Oracle buys Sun).
I've done a lot of talks on API design, focusing on how to not "paint yourself into a corner" in terms of backward compatibility. There is a complementary subject - API usability, that deserves equal consideration.
A few people know that since I was 11 I've been writing and recording music. I recently created a ReverbNation profile to share some of it. Of course, I can't resist prefacing a song with a bit about what it's about and how it got written.