HomeZone is great if you have $10 a month to spare. You get all kinds of on demand stuff, for a fee / show of course, the ability to hook your camera up to the unit (USB) and upload it so you can email to friends and family.
Music you have a nice selection, I don't think there is a charge.
Email from your keyboard QWERTY type style remote.
The ability to set your DVR recordings from your WAP 2.0 cell phone, or normal internet browser remotely.
Personally I don't think it's all that, but that's just me.