Mike Cane dug these clips up a few days ago. Note that the guy who made the videos isn't actually doing anything on the Nook; instead he is remotely connected to a PC and is just using the Nook as a second monitor. But it's still pretty cool.
BTW, these videos were uploaded by Youtube user "IhaveNoLife". This is true.
See the Nook Touch printing:
And here it is doing word processing:
Now watch the Nook Touch double as a monitor: