Google (or even General) Non Compete

How does a non-compete work with Google? Is it usually: 1. Thou shall not sell thy services to a lord who is working on the same project as you were in Google. or 2. Thou shall not sell thy services to a lord who is working on the same stuff as Google. WHich one is it? To me #2 would mean essentially not looking for work (in computing) for a year. And how desperate would you be (individual situation ofcourse) to sign #1 or #2? Cheers FG