That's cool and all, but boot partitions are usually <512MB. All that they need to hold are your kernel(s) and initrd, bootloader, and system map. Do you really want 4 drives doing this?
by boot partition I mean the partition for Windows XP so I would make it about 30GB and also one for Vista which would be around 50GB
any comments on expected performance compared to RAID1 or RAID0?