Just like the Media Center comments below... this only gets really interesting to me if it is connected to my TV in some way. Hmm... right now I have a big Netflix subscription that I'm a huge fan of... but I also have the ability to download some movies through the 360's marketplace...
Media Center integration would work for me, because of the 360, but I barely use my Media Center software at all now, so I'd be using it just for that purpose alone.
It all needs to get to my TV!