ADB to USB adaptors do not work well, at least in my experience.  That is unfortunate because adb was a fine set of connectivity.  In the end, it was another Apple connection that didnt catch on.  Firewire did and thats awesome because usb 2.0 sux for HDs.  With that said, if you do not have a compatible Mac, sell it to someone who does.  There are more out there than you think!