Oh, one more thing: Be sure to tell them the transfers need to be PC compatible. In other words, they need to check "enforce mac / PC compatibility" on the PT sessions, and if you have them back the data up to a firewire drive (probably more time efficient than using DVD's like last time, although a firewire drive is going to cost you more), then that drive should be a FAT32 formatted drive, which will make it readable on a Mac or a PC.
If there are any questions, they can call me... but I'm certain that as long as they know it needs to be PC readable, they'll know what to do.