For those of you who have been following the development of an iPhone-esque music player (ie PocketMelody, Lumen, S2P, etc)....A_C has released his first version of Slide2Play at XDA:
http://forum.xda-developers.com/showthread.php?t=370796
I think he is still working on a few things like AVRCP, but overall it looks great. Trying it now...