You could always set a recording of a live program and then start streaming it via the nomad thing, I would hope anyway.
I figure it is nearly identical to a slingbox for directv. As someone with a HD slingbox, it will have to get pretty good reviews and be a decent price to make me think about it.
Sadly, knowing DirecTV, I wouldn't be suprised to see a monthly fee attached, much like whole-home dvr.