I would suggest folks who are interested in these products look at the Addonics drives as the 'interface' cable can be changed from USB (2.0) to Firewire for less than $100 - this way you can start with USB2.0 now, then when Firewire becomes really common and/or Firewire PC Cards start being available you then upgrade the interface to Firewire, but keep the disk(s) and the data intact.

Look for a earlier post in the BBS in the last few days on the Addonics drives. They are my pick for notebook backup.