A year or two ago I was a member of Weight Watchers. As a member, you could access their web-tools online; food lists, calculators, trackers and more. There was also a pocket calculator that you could buy in case you didn’t sit around a computer all day or have a smart phone.
But, for most of that time, there was no native Windows Phone 7 app. There is now, but its tied to your active membership. If you stopped going, or had to quit due to finances, you might want another option. Two I’ve got right now are PlusPoints by HopNet Software and Diet Points Manager by johnmarkdyer. What are my impressions?