Oh - PS - iPods make good backup drives, too. I have had the 3rd, 4th, and now I just got the 5th generation iPod. This one holds 80GB - and it's portable. I got the iPod Camera Connector too -
http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/6054002/wo/Qp2aGtknx16P3hpOnGI2laZmI2K/1.0.21.1.0.8.25.7.11.0.3
I can plug in my CF cards with this connector and have the iPod upload them. The only thing better would be if an iPod could read RAW (it will only show you JPGs after the upload, if you shot in that format). But other than that - I use it on all my non-studio shoots!