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Zooko via diveintomark: Quick Reference For Choosing a Free Software License. Also see the FSF's list of GPL-compatible and other licenses. I had the opportunity today to choose an open source license for my day job. (Side note: if you can't ever imagine yourself saying that, are you sure you're in the right job?) I chose the new-style BSD license (without the obnoxious advertising clause). Exactly what we are open-sourcing is still a secret, but when it goes public, I promise to advertise the hell out of it.
And I guess I'm in the right job as I have had the opportunity to chose open source licenses on my day job.