Windows 7 Tip: 
iExporter is a small c# application that let’s you export iTunes playlists to any other location. That way you can have your iTunes playlists available on any other device (like usb stick, sd card or other mp3 player). iExporter exports mp3 and m4a files. It also creates a m3u (mp3 URL) playlist file for each exported selection. You don’t have to load iTunes to export the playlists. iExporter grabs the information from iTunes library file (which is an xml file).
Now you’ll be able to export all iTunes tracks for all Artists selected ( note: it will only pick up tracks where the Album Artists is the one selected!
Thanks for sharing this application