Normally you only can develop application for windows mobile via C/C++ or .Net CF. But as to me, I pretty hope to use more simple stuff to build app, like html and javascript, which means widget: http://www.w3.org/TR/widgets/. Like Opera widget, provides this dev feature, but it’s not Windows Mobile nature…

Great thing is coming, Windows Mobile 6.5 now supports the widget although I’m still hoping a better app list interface! Check out this about building widget on WM6.5, http://blogs.msdn.com/windowsmobile/archive/2009/06/04/getting-started-with-widgets-on-windows-mobile-6-5.aspx. Going to try creating something.