For whatever reason, Apple and Microsoft don't get along too well. Partly as a result, you were S.O.L. when it came to playing iTunes Store-purchased music in your fancy Windows Media Center Edition box...until now! MCE Tunes installs as a plug-in within Windows Media Center Edition and allows you to play, sync and fondle your iTunes music, even those songs encapsulated in DRM.
If it works as advertised, MCE Tunes can definitely fill a niche for you Windows Media Center users out there, especially since it's only $30. Too bad you haven't man'd up and set up a MythTV box yet.