TechLive reports here that you can buy a Creative Muvo MP3 player for about $200 and inside is a Hitachi hard drive that sells for $500
Here’s a partial list of cameras that’ll accept the drive:
Canon EOS 300D (Digital Rebel)
Canon EOS Kiss Digital
Canon G5
Kodak DCS Pro 14n
Minolta DiMAGE A1
Nikon D100
Nikon D1H
Olympus Camedia C-5060
The article has a pointer to a more comprehensive list.