In anticipation of Leopard, I got an external My Book HDD with Firewire for use with Time Machine. The capacity is the same as my internal on my iMac. (320GB). I was also looking to move my iTunes and iPhoto storage to an external drive as well. I was thinking to get 2 more My Book drives (500GB ea) and set them up in as a mirrored RAID volume in Disk Utility. That should get it all covered and everything will be backed up. My question is... is the three of these daisy-chained together with FW400 going to serve me well? Anything I should do differently? Is Firewire better than USB for an external HDD?