That's nothing, lacie has 400gb and 500gb firewire drives. The 400 is 7200 rpm with 8mb cache and the 500 is 5400 rpm and 2mb cache. The aerial density alone on these huge drives increases their speed. They are quite spendy, at $850 and $950 respectively.
And um, hate to correct you but it's not a firewire drive, it's an ATA drive with a firewire interface. I do wish they would migrate to firewire-native drives, but then perhaps when the drives are fast enough to take advantage of FW or FW2 drives, we'll have moved on from the primitive platter-based drives to solid state drives that aren't limited by phyical rotational speed...