iPhone Hip

There are many iPod sofwares you can pick up you the most suited ones.

PodWorks is able to extract audio files from an iPod to a Macintosh. A must have, if you might have a HD crash on your Mac, and you don’t want to re-rip 400 CDs manually.

Pod2Go allows to download News, Weather and more from the web to the iPod for offline viewing.
To get rid of the European Volume restriction, look at several alternatives like goPod.
Some handy programs Mac OS-X to handle your music collection:

iVolume performs a Sound Check based on human perception of loudness.
MP-3 Info, the ability to see MP3-tags in the Finder.
Applescripts can be used in combination with iTunes, to apply a couple of handy activities.
To get albums on your desktop, look at Clutter.

You can use iTunes for encoding and playback of AAC files, and synchronization with your iPod. This is good alternative to WinAmp.
MacDrive makes it possible to mount HFS+ drives on PCs.