QUOTE (Junon @ Aug 18 2007, 13:48)

Haven't been successful concerning this one so far, but there's a package of EasyTag compiled with AAC support (easytag-aac) over at
http://debian-multimedia.org. The repositories can be found on the site, the GPG key is
here.
Edit:
Medibuntu offers Amarok 1.4.5 packages for Edgy. Maybe even one with the desired MP4 tag reading/writing support, since they state that their repository includes packages that aren't part of Ubuntu for legal reasons.
I use the easytag-aac package from Christian Marillat (which is quite responsive, BTW) all the time under a Debian with an old Duron 600MHz and I have no problems with it.
It tags MP3s, FLACs, AACs, Vorbis and even Speex (I asked the developers of easytag for this and they replied promptly with the support, as you can see in the Debian Bug Tracking System. I am sincerely quite satisfied with it.
I mainly use it for tagging, but I use iTunes in an HFS+ volume to organize the files. Everything has worked quite fine with me for playing things with my old (2nd generation) iPod and Linux players (I use three: moc, amarok, and audacious---note that this is
not audacity, which is the audio editor).
I highly recommend that. Well, I highly recommend migration of anything to Debian.

Regards, Rogério.
P.S.: I discovered a very serious and silly bug in Apple's fsck of its native filesystem, HFS+. For more details, please see
Bug 436159 in a package that I maintain.