Ah, here’s a good example of everyday gadgets getting IP addresses and connected to your home network in some fashion – the Withings WiFi Body Scale connects to your WiFi home network (802.11g), uploads the data which you can then view the data on a secure Web-interface. Pretty slick.
Apart from weight, include lean and fat masses, it also measures body fat % and BMI. You even share the data via e-mail, Twitter, and post to websites. There is even a free iPhone app that you can use to see your results.
(Please note prices are subject to change and the listed price is correct to the best of our knowledge at the time of posting)