I agree that it enhances creativity, so it may be a match for a gaming company, especially when the game itself is targeted at a college demographic, but I don't think it is good for developing corporate systems.
In this sense, it may be the best fit for places such as twitter and facebook... their target demographic is not business people.
For myself, I think all software should be made in the most professional way possible, and I don't think goofing around is conducive to that.
That said, there is a large push to draw in lots of new junior level developers to get stuff done, and a belief that you don't need more than 1 or 2 engineers with 5 years of experience. My objection is that skilled engineers with 5+ years of experience continue to get treated the same way even as they mature and become able to be leaders.
