I had been getting an error message 48 unable to sync and it was driving me up the wall 

You can cure this bug by doing the following:
iTunes 7.6.1 / Firmware 1.2.3 / 5th Gen Video iPod
BACK UP YOUR ITUNES!!!!
Set your mac clock to SPT (Southern Pacific Time) then Press restore your iPod in iTunes. This will format the iPod. Reload all of your music in to iTunes and then reload your music back on to your iPod, et vola
You can now change your clock on your mac back to GMT
It worked perfectly for me.

You can cure this bug by doing the following:
iTunes 7.6.1 / Firmware 1.2.3 / 5th Gen Video iPod
BACK UP YOUR ITUNES!!!!
Set your mac clock to SPT (Southern Pacific Time) then Press restore your iPod in iTunes. This will format the iPod. Reload all of your music in to iTunes and then reload your music back on to your iPod, et vola
You can now change your clock on your mac back to GMT
It worked perfectly for me.