I also find it takes 4-6 minutes to backup the iPod touch to iTunes on PC. Further, I started a thread some time ago about the "other" category (which I understand to be OS and other fairly critical files) being missing on the status bar in the sync window on the computer when connected to iTunes for backup. It came back for a while but has now disappeared again. I wonder if this is the cause of the slow backup and aside from rebooting the iPod touch what can be done about it?
Nevertheless, the iPod touch does eventually backup and sync so I don't think I have a big problem. What thoughts does anyone have?