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Thursday, September 20, 2012 at 8:50AM 
The Zip is the latest version of FitBit's activity tracking wearable device. Like their original Ultra and the newer One, it uses an accelerometer to track your activity: steps, distance, and calories burned. It syncs information wirelessly to your computer and to some smart phones. Unlike the Ulta and One, it is not intended for sleep tracking.
Gizmodo has a review of the Zip
Sunday, July 15, 2012 at 5:07PM Track the weight and body fat of up to 8 automatically recognized people in your home with the Fitbit Aria. The scale uploads information wirelessly. Between tracking your weight and bodyfat with the scale, and tracking your activity (and sleep) with the Fitbit Ultra there is some powerful motivation.
Sunday, October 9, 2011 at 9:17AM 
Fitbit has released their new Ultra device, which tracks stair or hill-climbing. It also includes a clock/stopwatch.
Monday, September 12, 2011 at 6:00PM ReadiBand is a wristwatch-like device which tracks wrist movements to estimate how you are sleeping:
Our scientifically proven system is highly accurate. A recent study showed that the ReadiBand™, coupled with our patented classification algorithms, assessed sleep virtually as well as sleep lab polysomnography (93% accurate).
Based on ReadiBand™ data, we provide a range of sleep statistics, such as sleep efficiency, sleep duration, and time to sleep onset. In addition, once the ReadiBand™ data are automatically processed through our patented and validated computer model, fatigue risk levels are calculated and displayed
The ReadiBand was recently used by the Vancouver Canucks in their NHL playoff run. In the video about the Canucks, they also mention wearing the device 24x7 and measuring the impact of sleep on reaction time.
I'm trying out a fitbit now. I wonder how ReadiBand compares?
Tuesday, May 31, 2011 at 12:14PM This piece from Forbe's CIO Central predicts self-tracking as the next big thing after social networks:
...I contend that, what’s unveiling under our eyes is probably one of the most transformative changes of our civilization. You can argue that the rise of social networks can be interpreted as our people’s need for more attention. However, the willingness that newer generations have to keep track of daily activities and report about them to their community of friends, coupled with the advance in self-tracking technology, creates a perfect storm for a new wave of social data companies.
...
In their wonderful book (“Your Life, Uploaded”) Gordon Bell and Jim Gemmell walk us through the techniques they have used to collect their own data. Bell and Gemmel encourage readers to engage in life-logging (as opposed to life-blogging, which you can witness on sites like Facebook or Foursquare). You must read this book if you want to understand the history of personal data and get a glimpse of what the future has in store for us. This work reminds us that, beyond sharing experiences as they happen, in very transactional ways (“I’m having coffee at Jody’s”), we should realize that our daily activities amount to a large number of data points, which in isolation might appear meaningless but in aggregate could inform us better about our lives.
Forbes, fitbit, investing, selft-tracking in Getting Started