Don't let Apple's lack of USB 3.0 support get you down. LaCie has you covered with the 2big USB 3.0 RAID drive, and Engadget has run benchmarks on it.
The gang used a "relatively new" Mac Pro with the following specs:
Apple Mac Pro (2009)
2.66GHz quad-core Intel Xeon 'Nehalem' CPU
6GB (2 x 3GB) DDR3-1066 ECC memory
NVIDIA GeForce GT 120 (512MB) GPU
18x SuperDrive
Mac OS X 10.6.5
Bluetooth 2.1+EDR
LaCie USB 3.0 PCIe expansion card
In addition, they used a 2big USB 3.0 drive, a 500GB Iomega Skin (for USB 2.0 work), a 500GB Seagate FreeAgent Go FW (for FireW
