Time Tracker Tags
This is a set of three portable timers that you can hand out to children to help them accomplish tasks, chores, or homework within a certain time period. When the minutes are up, each timer will beep and light up, and all the while you can monitor all three timers from the base. Genius!
Oh wow... this is so cool. So far I've been getting my teenager to use xpunch.com but this might be even better!