Wanna log your weight and have it converted to a nice graph on your iPhone? Skinnyr for iPhone allows you to track your weight on a graph. The web app allows you to view your graph, add records and remove records. Perfect for on-the-go weight watching.
Note: This app requires registration. To use the iPhone webapp you need to create an account with Skinnyr on their main website here first.
You must be using an iPhone to see the iPhone version of this app. Try it here