I've been mining with a 5770 in my HTPC, but the fan on it has started rattling and is very loud, so I've switched back to onboard video. That said, I took off the shroud and realized that it would be easy to add a case fan to it if you were resourceful enough because the fan on there now can be removed. I don't feel like dealing with it and it's almost summer again, which makes mining painful since my AC sucks.
I'm selling it for 11 BTC shipped Priority. It will go out tomorrow if you order before 9AM EST.
Successful transaction with OgNasty here: https://bitcointalk.org/index.php?topic=66798