I've found that MediaMonkey 2.5x and 3.0rc4 generally autosynch well with the COWON D2 in MTP mode. I use MTP mode because it's the only way to have MM generate binary .pla playlists (i.e., the D2 does not use plain text playlists).
Problems include:
1. All files are recopied on every synch (regardless of using autosynch or Send To...). Happens every time.
2. Playlist .pla files placed on the D2 during a synch are sometimes empty. I'm still testing to determine if a repeatable user scenario exists for this.
- wader

