Congrats Gil! iPods won't allow you to transfer music from one computer to another - it's part of that pesky copy protection. Copy your songs off your old computer to a CD/DVD or two or three (depends on how many songs you have) - easiest if you have another external hard drive that you can use for this. Then, copy those songs onto your Mac's hard drive into the Music folder of your home directory. Then have iTunes on your Mac import those songs into its library. It'll have to erase the songs on your iPod and reload them in off your Mac. A pain, I know, but one of the prices we pay for copy protection.

Masaki