This is all well and good, but I'm waiting for someone to put 4 SF2200 controllers on a single module with a SFF-8087 6Gb SAS interface for a regular RAID card to utilize. Put 4 boards into a 3.5" form factor container with an interface backplane to split the 4 SAS channels for 4 logical drives. Then use a proper SAS/SATA raid controller to run them in RAID 0,10, or 5 as your use dictates. That will give you the bandwidth you need with a form factor that will be easy to work with. Then we'll need motherboard makers to put 4 of the SATA channels from the southbridge into a single SFF-8087 connection.
Who knows, maybe this could be taken externally with a SFF-8088 connection.
BTW, you mentioned how this compares in price to 4X 60GB VErtex 2 drives in RAID 0, but no benchmarks to compare them to this monster. How come?