A few days ago I found a google application that calculates a running average for people who weigh daily. It gives you a chart so you can see how things are trending.
Today is my second day using it, so it isn't terribly helpful yet. However, I think it will be cool to see the trend lines and help mitigate the "OMG I gained today" thoughts when you can see how the weight it trending.
Check it out:
http://www.red-bean.com/fitz/ig/google15/faq.html
Anybody else use it? What do you think?