As soon as I get off my butt and quit watching so much Voom, I'm going to reprogram my Pronto to work with all of my new gear. I still need to put in: Voom, DVHS deck and my Projector. Right now I have 6 remotes laying on my coffee table and have to do a juggling act every time I switch devices.
It is for future expansion if Voom chooses to use it. It can be used for many things from a Home media option of being able to stream video or audio to being able to receive guide data and updates from Voom via the internet.
We will have to wait until Voom has an announcement as to what the future holds for the USB port.