Ok, time for a bit of showing off my rig:

5x Sapphire Radeon 7970
3750kHash/sec Litecoin
and blowing the heat right out of the window!
Very clean rig. Nicely done.
Not to nitpick, but wouldn't it work more efficiently to rotate it 180 degrees and reverse the flow of the two large fans to compliment the exhaust of your video cards, rather than push against them?