A while back, when PhoneGap for Windows Phone was still in beta, I created Property Finder, an application for searching UK property listings. This application successfully made its way into the Windows Phone Marketplace, making it the first WP7 PhoneGap app.
I recently developed the Property Finder application further in order to support iPhone. You can see the application running on both devices below:
I have published an article on CodeProject which describes this application in detail, and also has the full sourcecode.
Regards, Colin E.