John Miller, IPMS member and owner of Model Paint Solutions (modelpaintsol.com) has an electric pencil sander called the David 400 (D400) on his web site. The sander has a wall cord that plugs in the back of the sander, fits nicely in the hand, and is very comfortable to use.
When I first saw the tool, I thought why do I need an electric sander? I have an abundance of sanding tools already. It just so happened that I was working on the Airfix 1/72 scale Tiger Moth and had a very small area to sand under the horizontal stabilizer. With that small an area to be sanded and the delicate nature of the sanding that had to be done, I thought the D400 would have made the job a lot easier and faster.