Who are your favourite development studios ever, and why?

[Andrespetmonkey]

Kresnik said:
To all the people who have said DICE, a quick question: Are you a fan of their continued work on the Battlefield series, or do you follow all their other projects too? (i.e. Mirror's Edge)

I'm a Battlefield fan, and I choose them mainly for that, though I like Mirror's Edge also.