Well, I don't think there's been enough testing on OS2008 yet to tell what's been fixed or newly broken, but the OS2007 media libraries choked on several things: 1) Unicode in tags, 2) Embedded cover art, 3) multiple versions of tags in one file. I found the best thing to do was use a tool like MP3Tag to eliminate 1) and 2) and only write out the latest tag version (v3.3 I think?). Unicode support may have improved in OS2008, but wouldn't bet on it.