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: 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.
Tutorial -- thanks to Maeghaus