raid shouldnt give a big increase as the SSD is already electronic, with platter drives the raid allows writing to one while reading form the other at the same time so you get a big increase over the mechanical disadvantage... and with raiding you have the potential of more problems and BSOD's.

also from what I have found, the SSD's aren't that great for a boot drive. I might wait to see more people doing this before booting from one. I want to get one and use as a gaming drive, but want to wait till the technology stabilizes a bit.