I’m still a fan of the Withings Wifi scale. By simply stepping on and off a very attractive piece of glass in our bedroom every morning, I can check my weight stats on my computer or phone. Nothing to manually enter, nothing to manage.
Here’s the graph of my weight over the course of 2011. Note that I’m 6’2”, with sedentary physical activity, BMI of 21.8.

A wash, overall - I mostly stayed within the ~2 lb margin of error. I didn’t get close to my totally arbitrary goal of 165 lb. While I felt like a deep-fried donut over the winter holidays, I actually ended up seemingly losing 2 lb during that period.
The scale attempts to measure my body fat percentage as well, but this is generally considered unreliable. My figure hovered around 10%.
If you’re interested in owning a well-made, pretty, and Internet-connected 21st-century scale, here’s an Amazon affiliate link. Godspeed.