Hah! Now we can find the one-armed man! Advertising hype reads:
"Providing an impressive 350 pounds of clamping force, this battery-powered tool from Black & Decker has a slip-resistant design and offers a release lever for fast, effortless screw adjustment. Able to be used as either an auto or manual clamp, the ACC100 is a snap to operate with just one hand, and features feet that won't scratch your work surface, as well as a six-inch opening to accommodate a range of different jobs. Most importantly, it supplies approximately 60 clamps on a single set of batteries, and is ideal for gluing applications and securing wood for cutting, sanding, or painting."
Looks like it's time might have already moved on. One seller on eBay has them for $12; another eBay seller has one for $19.99 plus $9 for shipping. Sears, however is selling them online for $6.