Are there any good bandwith limiter programs out there?

[arod]

I am getting a roomate for the summer who likes to be a dumbass when it comes to certain things.... specifically trying to serv on a cable modem. I was looking for some sort of bandwith limiter so he couldnt abuse my cable modem too much. I dont want to lock him out just limit him to about 5k/sec uploads... I would need it to run pretty secretly if possible.