Realtime Wireless Heart Rate Monitor
I'm guessing that you want one of these things:  TI EZ430-Chronos

Basically it's a watch with an interface for those pulse-rate sensors, and some other type of wireless link to PC's.  Oh, and of course you can program the microcontroller in the watch to do whatever you want.

If that didn't get your pulse rate up, here's some more things:  3-axis accelerometer, pressure sensor, temp sensor, 96-segment LCD, and USB dongles for wirelessly connecting to a PC.

The best part, it's available for US$50!

Happy Hacking!