Livestrong.com has a neat program from tracking diet and exercise. The diet tracking part is pretty standard, but what I like about it is that you can map and track particular exercise routes, and save them for later.

I no longer have to guess how far I walked when I take a midnight stroll around my neighborhood, or how far my bike ride was. The fact that it includes the elevation changes is particularly nice. Not entirely without bugs, but very handy.

It also comes as a mobile version for iPhone and iTouch.