I want to record (lets say) one hour of my favorite N.Radio station listed in iTunes.

Anyone know if this is possible on a Mac version 10.4 and the standard software installed on it?

If not, what simple utility can I use?

AudioHijack will do the trick, but the full version costs money. Also, you should make sure you have the copyright holder's permission before you record any of their stuff.

It's possible with a BeoSound 4 too, record N.Music onto the A.Mem card, and transfer the recorded files across onto your computer.

I use AudioHijack. Very good it is too! I don't see this as any different from video or audio taping if used for your own use. Time shifting is not illegal!