OCZ launched its RevoDrive that uses 4x PCI-E to achieve 80,000 IOPS.
OCZ RevoDrive Combines 2 SSDs in RAID via PCI-E : Read more
OCZ RevoDrive Combines 2 SSDs in RAID via PCI-E : Read more
To be honest I thought it would be a lot pricier... but I don't think you can boot from PCI-e SSDs, so no thanks.
Both versions will also be bootable, promising quicker boot-ups