Well, I picked one up, and absolutely love it so far. Haven't done anything too taxing with it yet, but it really is a joy to use.
Ran some Geekbench benchmarks if anyone is interested - the numbers it spat out for the 1.2GHz were:
32 bit
Single core - 2436
Multi core - 4836
64 bit
Single core - 2634
Multi core - 5404
Remember that the first 24-48 hours of power on typically involve a lot of indexing and other administrative/housekeeping by the OS, and if you have encryption turned on, FileVault will also require power-up time on mains power to encrypt the disk. Those can affect benchmarks!