In November 2009 I started using myfitnesspal.com, a free online food and exercise tracker with a helpful app for iPhones and Android phones. I have lost 3 stone in weight by setting my weekly target at a lb per week.
The British Heart Foundation Healthy Heart Recipe Finder. You can browse 100 recipes from all over the world, use your app at the supermarket to find the ingredients that you need and email your favourite receipes to friends. http://www.bhf.org.uk/heart-health/prevention/healthy-eating/bhf-iphone-app.aspx