iTunes Related Threads on Interact
Switching from iTunes to MC25
An iTunes Skin: http://yabb.jriver.com/interact/index.php?topic=60231.0
Buying music from Amazon instead of iTunes: http://yabb.jriver.com/interact/index.php?topic=58711.0
MC15 added a feature called Playlist Sync which uses iTunes for the actual Sync.
M4A files can be played with DirectShow.
MC15 supports AIFF files.
MC16 natively supports all non-DRM Apple formats.
MC25 added iTunes Playlist Import. This imports all your iTunes media but does not move files or change them.
MC can import iTunes playlists if they have been exported from iTunes in xml format.
Tutorial -- thanks to Maeghaus