Stopwatch and Splitting Your Computer and LCD Screens

I learned a trick from a 7th grade teacher in my building that if you want students to work more quickly - esp. using technology, give them a clock and break the assignment up into parts.  My favorite clock is this one.  It both counts up and down.  Also, if you have the new Windows on your computer, you can go here for an explanation of how to put one thing on you LCD monitor (the clock, perhaps) and another on your computer.  That way you could help a student with his/her work while the clock was on the LCD.