Mark-my-time would be my next timepiece, were it not for the fact that it is not the colorful retro wristwatch it appears to be, but instead a useful educational tool for children. Rubbery bookmarks that can be set to count up or down to a preset time, they're designed to help track how long a youngster's spent poring over the tomes. There's also a version aimed at music students, which includes a metronome with 5 rhythms. For the grown-ups, Mark-My-Time suggests using it to track workout sessions. They're available right now for $9 and up at the product page.