Ah, so you're talking about something like a Fitbit or Fuelband?
Never had one of those. I can see the draw, but I think if you're training for something more seriously they aren't good enough - and you'll end up better off with a sport-specific app or watch. For that, I currently use a Forerunner 610 in conjunction with TrainingPeaks
TrainingPeaks was co-created by Joe Friel, who wrote some great books on endurance training and is a well known cycling and triathlon coach. Best I can gather, the site is geared mostly towards more serious triathletes (or those competing in any of its three sports). When I started running, I just used in iOs app to track my runs (Runkeeper) - it was fine enough, but when I wanted to start training more seriously I came across one of Joe's books. My fitness level has improved dramatically since moving to the approach he coaches, which admittedly requires more quantifiable metrics, and I wanted a better way to track things. Enter the Forerunner and TP site - it's probably overkill, but I'm a numbers guy, and I like the wealth of information and data. Not sure if this link will work, but I picked a random running workout of mine and flipped it to 'public' so you can see some of what it keeps: Activity | TrainingPeaks
I think if you're just running or swimming for general fitness, it's way more than you'd need. If you're thinking of doing it more seriously, or competing, then I love the information.
Another good site for comparing hardware devices is DC Rainmaker .He's basically the go-to guy for reviews.
I like numbers too. It helps me see where i have been and where im going. But i am all over the map in the exercises that im doing. Its a bit of everything. The website part im not overly concerned about. But I would like to get a watch that would be able to track some of my fitness related numbers and allow me to look what i have done for the week.
I will read some of the reviews that Rainmaker puts out. Is there a watch that is suitable for a variety of exercises. One day i am in the gym the next im playing hockey and the next im swimming. Is there a devise that can read those kind of exercise.