Search VersionTracker for a program that will do this. I used Escape Pod, and it worked fine except for the fact that it couldn't see my AAC files. The latest issue of Macworld recommends the following apps...
PodMaster 1000
Podestal 0.2
Open Pod 0.51
iPod Tracks to Desktop
Xpod 1.3.6
Again, search VersionTracker for these.
-M