Attaching IDE Disks to SCSI Controllers?

A not-so Anonymous Coward brings this query to the forefront: "A German company has an adaptor that will allow you to use cheaper IDE drives with SCSI controllers. There is also another company selling RAID enclosures that look LVD but take IDE disks internally. Raptor RAID is the name, but I can't find the actual company's web page. I did find This review. Anyway, how do these things work, and does anyone make adapters so an individual can attach an 80gig IDE disk to their LVD chain and save $500+USD per disk."