Tim Bray has an excellent and thoughtful post on why he chose to work at Sun Micrososystems. Best of luck to Tim in his new endeavor.
UPDATE- I received a comment that Bray's assessment of .NET is inaccurate. I think that his views on .NET represent his perspective, and while they're not the same as my views I didn't judge his post on technical merit or based on his opinion of Microsoft. I think that the excellence in his post comes from his description of his thought process in deciding to join Sun and also in the mechanics of how they recruited him.