karen - i'm pretty sure they now make watches that keep track of everything from how hard you pant on a tough climb to how many inches those 3 krispy kremes might put on one's backside....

Seriously though...

I've seen some watches/bike computers, that keep track of altitude, calories burned, laps, pace, cadence, power output, etc etc.

Most of those things really aren't worth it to me - with programs like toporoute.com for instance - i can keep track of how far i went and how much i climbed. For me, a HR monitor with programmable limits, zones, and lap ability is more than enough.

other folks though may want or really need the higher end features. (just look at this: http://polarusa.com/Products/Consumer/S725x.asp )

it is the eternal question of what's it worth to ya?