Sphero 2B

The original Sphero – a plastic ball that magically rolls around where you direct it via smartphone app – was the kind of gadget you can't seem to put down. The 2B is the hot rod version, a two-wheeled spitfire that rockets up to 10 mph, turns on a dime and is equally addicting. Pity your kids, who will have to content themselves watching you pull tricks for hours at a time. [$99 due this fall; gosphero.com]