itunes week, obviously...

if you should experience problems with itunes 4.9, airtunes and some of yourtunes (ie. certain mp3s won't play remotely): that's mainly caused due to incompatible creator/type settings in a file's resource fork.

i managed to solve this issue by downloading marc respass' type changer 1.2.1, opening the desired files and changing type to MPG3 and creator to hook.

uh, and for the not-so-faint at heart having the developer tools on disk there's the option to do it the unix way from within a shell:

/Developer/Tools/SetFile -c hook -t MPG3 AudioFile.mp3

(but please make a backup of your mp3s before you start!)