My first wish for the HSX-109 is that it be able to squirt tunes into the Rio Riot and the Rio Car. I would like to be able to use the HSX-109 as my primary music storage device for everyting, and remove all MP3s from my PC permanently.
I don't necessarily need advanced playlist management capability from the HSX-109, I don't mind having to hook up Emplode to fiddle with the car player. Just the basic "send tunes to the car/portable" capability.
I'm reasonably sure this is on the wish list of the development team as well, I just wanted to make it official here before anyone else did.