@BitFlipper: I do all my development on laptops. Usually my HP 8540W, which is beast. 36GB of ram, 4 cores ... heavy as you'd expect. Video encoding is a common need though, even just when I doing dev work on our encoding system and testing things.
Recently though I got a Yoga 2 Pro (or Pro 2, not sure) and I'm testing it out as a dev box while I'm here at Build. It is working really well, runs Channel 9 just fine, couple copies of VS. Has a crazy high resolution display that means text looks beautiful.