I have used jQueryMobile to build a mobile website. Mobile websites use the same technology as non mobile websites, they are just designed for use on a mobile device. jQueryMobile is a javascript library which helps with mobile site development.

I have built several apps for both the Android and Windows Phone. These have just been apps for me to try out the platform and nothing I have released. Some examples are a Pong program and a timer program for children. I have also attended a 2 day seminar on Windows Phone development.