Nitobi's PhoneGap project helps app developers to code for multiple mobile OSs simultaneously, thanks to the open standard wonders of HTML5, JavaScript and CSS. It's supported Windows Phone since the beginning, but v1.3 builds on that friendliness by opening up the API's full feature set and hence every limb and organ of a Mango handset, from the compass right through to storage and notifications. New plug-ins yield extra goodies, like Live Tile updates, BingMaps Search and social networking integration. Plus, in the interests of fairness, the full list of improvements (at the source link) contains some nuggets for Android, iOS and BlackBerry coders too.