Several companies now have watercooling blocks available for the 3870X2.
Like dangerden:
http://www.dangerden.com/images/stories/blocks/3870x2/proto-1-600w.jpg
and coolit:
http://www.coolitsystems.com/images/stories/pr/680-cps.jpg
and EK
http://images.ncix.com/forumimages/10E9D571-C25A-8E42-116B14B3704603B3.jpg
and aqua-computer
http://www.aqua-computer.de/prodimg/3870_X2_2.jpg

(info found via computerbase.de)
Several companies now have watercooling blocks available for the 3870X2.
Like dangerden:
http://www.dangerden.com/images/stories/blocks/3870x2/proto-1-600w.jpg
and coolit:
http://www.coolitsystems.com/images/stories/pr/680-cps.jpg
and EK
http://images.ncix.com/forumimages/10E9D571-C25A-8E42-116B14B3704603B3.jpg
and aqua-computer
http://www.aqua-computer.de/prodimg/3870_X2_2.jpg

(info found via computerbase.de)
It's the 3870 X2, not just the 3870...
The card is actually a 3870X2, you had me thinking it was a regular 3870 which wouldn't have been that exciting.