[dcreemer]

For a slightly cheaper approach (assuming you already have an iPhone): I have been successfully and pleasantly using "Lose It!" [1] to track all of my food and exercise for about five months now. So far I've lost 20 lbs and 2% body fat. For sleep tracking, I am using Sleep Cycle [2] to measure sleep hours and (most importantly to me) wake me up at a good time. Nike+ [3] on my iPhone tracks my running times, route, distance, etc. Total cost $2.98 (plus an iPhone of course).

I've been amazed at how easy it's been to get into reasonable shape by changing only one thing: consistently collecting the right data.

[1] http://www.loseit.com/

[2] http://mdlabs.se/sleepcycle/

[3] http://itunes.apple.com/us/app/nike-gps/id387771637?mt=8

[Samuel_Michon]

Excellent suggestions. I had assumed that Nike+ still required you to have Nike+ shoes, but apparently, nowadays it works with the iPhone's GPS. Downloading it now.

[freshrap6]

You can buy a pouch to hold the sensor onto non-Nike shoes. They usually are no more than a couple bucks. I'm sure there are hacks out there too.

[dekz]

Will Sleep cycle pick up my partners movements and wake me up at an inopportune time?

[nosignal]

I used it, and I just kept it on my side of the bed, it worked fine. I guess it depends on your mattress, but unless your partner is shifting around enough to wake you I'd say it'd be fine.

[dcreemer]

I've never had that problem, though I do have a memory-foam mattress. Sleep Cycle has always worked exactly as advertised for me.