The K850i supports microSDHC cards (I'm using a 4 gig SanDisk card in mine).
It also supports MTP (you have your choice of using MTP mode or phone mode) and it works with cards. MTP works with Windows Media Player 10 and 11 under XP and Vista does it natively. The phone reads ID3 tags, so you get artist, album and title each song.
It doesn't transfer ratings and there's no way I've found to create a playlist based on ratings on the phone.
-------------------- Lisa Gade Editor in Chief, MobileTechReview