One of my projects has been building an HTML Application framework for phone 7. Basically so I can build HTML5 based applications using HTML, JavaScript and CSS for mobile devices in particular Windows Phone but then being able to use that application on other platforms. Today I uploaded version 4 onto codeplex (http://htmlappwp7.codeplex.com/) which adds HTML Host Application back stack integration with the Phone's application navigation stack. On wp7 that means that when you hit the back button it doesn't just navigate out of the app but just to the last view in HTML making really applications easy to do that will get past the marketplace and into the hands of the public but even more important setting the stage for apps on iPhone and android using similar HTML5 based application frameworks.
The first app using this framework was the JavaScript application but now that test app is in the marketplace I've been working on a new real app called 'SMART Spending Habits', its a simple budgeting application designed to priority and sort your purchases automatically. Its a great little tool and it should be in the market place next week or so.
