Adding a USB hard drive to your PS3 or Xbox 360 isn't as simple as plugging it in (
and on the 360 especially, it's pretty much a hack). But Datel's new Space Docks make the process simple. UPDATE
Their Space Dock, available in PS3 and Xbox 360 versions, accepts 2.5" or 3.5" SATA HDDs (up to 1TB) just like cartridges before what we can only assume is an automatic formatting and file install process that allows stock drives to be instantly compatible.
Once installed, the drive mounts in your system to backup saved games (a feature that looks exclusive to PS3 version), play movies, etc, plus you can always plug the drive back into your PC to transfer more files since the formatting structure is really just FAT32.
$40, available soon and kind of neat. (Datel is free to use that catchy sales pitch, if they'd like.) [Datel via Maxconsole]
UPDATE: Hmmm, the Datal doesn't look to do anything special that any standalone hard drive dock cannot, though I'm still curious as to whether it at least sets up the directory trees for PS3 use.