If the two machines are on a network then it is a relatively easy task to move all your audio files from one machine's iTunes into the other. If not, then a thumbdrive will work just as well.
Before you attach your iPod to the Mac, attach it to the PC and set the preferences to Manually download files to the iPod. This will prevent the iPod from picking up an empty load when you first connect it to the Mac.
There is also the issue of the format on the iPod. While the Mac will be able to handle the iPod in its PC format, Apple does not support such a configuration. Best to format it back to Mac, at which point you will loose all the music on the iPod. Follow the instructions that came with the iPod or take a look at the Apple site for the user guide.
Do all this AFTER you have moved all your tracks from the PC to the Mac.
WIth a little thought, your move will not be as traumatic as you thought
Hope this helps
I got a windows pc, and a mac, I use my ipod on the pc, but now I want to use my ipod in the mac, can I do that? I know probably I1m going to loose all the music on the ipod because my itunes in the mac is empty, but i can burn my music to cds and then transfer it to the mac, I just was wondering that after i used the ipod in a pc is it posible to use it in my mac?