Andy Drake at BXBoards shows us how it's done in his review of Abit's KA7-100 motherboard, concentrating on the schmancy new I/O features of this puppy. I chatted with Andy a bit on ICQ the other day, and he was very high on the performance of the KA7-100's RAID abilities.
Thing is, the board doesn't even officially support RAID, though its ATA-100 controller will obviously do it. What's a potential RAIDer to do? Go to this page at Andy's site for a new (unofficial, beta, and possibly right-wing) KA7-100 BIOS and drivers with better RAID support.
Meanwhile, down under in the Queen's colonies, Dan of Dan's Data has been storing Dan's Data on Dan's New RAID Array. He's written up his experiences with his KA7-100 rig in an excellent article on desktop PC RAID. As always, Dan's stuff is exceptionally well written; despite the fact I can't make heads or tails of those Australian prices, you've gotta read this one.