Sapphire demonstrated its completely passively cooled Radeon 3850 and drew a lot of attention with it. We managed to see the card in action, rendering some nice HD video and not getting extremely hot. The card doesn't have any fan on it and it will be available in a few weeks time.
Sapphire's reference design Radeon 3850 with single slot cooler is already available, but this card is just more fun and interesting for those looking for a nice HD card that runs very quietly.
It might not be thin, but at least it is cool and silent.