Restoring an iPhone backup to an iPod touch may result in unexpected behavior on the iPod touch (such as the device resetting repeatedly).
If you have restored an iPhone backup to your iPod touch, restore the iPod touch to factory condition, and then select the correct backup to restore your settings.
If you experience difficulty restoring your iPod, then see this document for steps to put your iPod touch into recovery mode.
Use iTunes to update to iPod touch Software 1.1.3 or later to prevent this issue from occurring.