Don't despair! You're not totally stuffed! THERE ARE RECOVERY OPTIONS! If only the PSU is dead, there is a piece of software I've used called Zero Assumption Recovery (and it's not the only software that can do this, but its the one I've got experience with).
I've done this on a WD 2TB MyBook drive (2x 1TB):
1) Plug the drives into your PC (in any manner, internal, SATA, eSATA, USB caddy, whatever)
2) Make sure that you don't let Windows initialise, format, or prepare the disks (just cancel whatever wizards pop up)
3) Run Zero Assumption Recovery - http://www.z-a-recovery.com/ - and tell it you want to repair a RAID volume (You might need to pay for it)
4) It will do a byte-level inspection of your two disks to re-create the RAID. If it finds a file system, you can go ahead and run your recovery :)
A better tutorial can be found here: http://www.z-a-recovery.com/raid-recovery-tutorial.htm