first bug i found: The Experience Index rating.
specifically, it is supposed to rate from 1.0 to 7.9 instead of the old vista-ish 1.0 to 5.9. The harddrive rating is topping out at 5.9 still.
I confirmed this by having three clean windows 7 installs. One install ran off of a single sata150 500gb drive. rated 5.9 by itself (also rated that fast in vista). For comparison, my wife's computer has an 80gb sata 150 and it rates 5.7.
Next, i installed a raid10 array. three sata300 drives and one sata150, all 160gb. Total partition size = 320gb. It also rated 5.9.
Finally i said "screw it" and turned the same array into a raid-0 stripe array witha total size of 640gb. It rated... 5.9!

Bug #2: The nvidia driver it comes with locks up. The nvidia one on their website fixes it.