So yea... Just got the Sprint Palm Pre (I love webos, just wished there were more apps).
So I tried connecting the phone through the usb port and it so happen there is a feature called "Media Sync" on the Pre. Selected on my phone and now not only does it charge the phone but the HU recognizes the mp3's on my phone.
The only thing that sux that the PRE cannot receive calls while its connected. That's why i have the ipod connector as well so I can listen to my music.
This is just a heads up for people who might be buying the Pre and was wondering if it works w/ the HU