That Acer Aspire looks pretty neat to me, actually. I like it a lot. The only time I don't have a mouse plugged into my laptops is if I'm somewhere with awkward ergonomics like the couch, and the above keyboard thing works fine for that. I also don't like having to worry about whether my hands are resting on the touchpad, and this takes care of that problem.
The placement also encourages use of the touchscreen, as well. Since your hand is right there and all.(I'm assuming it has a touchscreen, haven't looked at the spec page).
Admittedly, I've got some different ergonomic concerns than most, having broken both wrists and sprained them each through a multitude of sports injuries. Along with tendinitis, and a carpal tunnel scare. From all of that, I NEVER just reach my thumb back to use a touchpad, I move my entire hand. And having it above the keyboard is just as much movement as moving my hand to the side for a mouse or below for a conventionally placed touchpad.
edit: I hope they build a desktop dispay with that hinge though, I really like the mounting options. Hopefully before I get off my butt and make myself something similar for my desktop monitors, I've wanted to for a long time.
