Ok, so this is pretty geeky, but it shows how fast a RAID 0 set-up using SSDs (Solid State Drives....basically using the same technology as your CF or SD camera card) can be.
I have an SSD in my MacBook Air and I'm a huge fan of these drives. They are solid, quick, dependable and silent. As they have no moving parts, they should last longer than traditional mechanical drives and more so, they are rugged as movement doesn't damage them.
This is definitely the shape of things to come.