This is a diceroller.
Nothign new, I know, but this is slightly different. It's a simple HTML diceroller, with a twist - if you have multiple people using it, and they all put in the same password, everyone one with that password can see the dice - and you can also color the rolls as well, further seperating them.
It was a pretty nifty tool. http://www.catchyourhare.com/diceroller/