Banshee the iTunes for Linux

If you are looking for iTunes software for Linux, you wont find any (at least today). But Banshee with appropriate codecs could replace iTunes completely.

Banshee is better

1. Banshee bypass iPod song protection, so you could savely connect any iPod using USB to your laptop/PC without worry that the song inside the iPod will be overwriten by Banshee.
2. iPod will also look like an external USB flash drive, so you could copy/put any files (song or other type of file) inside iPod

Apple AAC support
You could install the following codec to be able to play AAC, MP3 etc :

#install banshee
#gstreamer - for playing MP3 files
#gstreamer0.10-plugins-bad-multiverse
#gstreamer0.10-plugins-bad
#gstreamer0.8-faad.
#gstreamer0.10-ffmeg - mpeg, mpeg4, ac3, wmv, and asf
#gstreamer0.10.5-0ubuntu2 (gstreamer0.10-plugins-ugly) - play DVD

sudo apt-get install banshee gstreamer0.10-ffmpeg gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multiverse gstreamer0.10-plugins-ugly gstreamer0.10-x gstreamer0.8-faad