the internet scale! the first really network attached household device (which makes some sense at least!) ;-)
wiscale
twitter your weight, like some people already do: i weigh in public or submit it to google health!
the web dashboard is the extension of your wifi scale. from any web browser, or from the free iphone application supplied by withings, you can log on and see a rich, relevant view of all of your weight data collected by your scale, with no time limitation and in total confidentiality.
the iphone app collects your data and graphs your results:
wiscale iphone app
found during browsing the apple appstore for apps which can graph my daily weight, now available for ~129 euros at: withings.com
read on:
coated.com
techfresh.net
wired.com
gadgetreview.com
ohgizmodo.com
chipchick.com