HTML 5, CSS3 and Javascript is largely supported by most modern browsers including IE9. If you stick to the standards then you will have an app that will be supported by more devices. Take a look at www.jquerymobile.com. This project is just about to go to beta and it does work quite well. By using stands your app will work on more devices.

>I want to create a small app, web application, to work on Safari (mainly for iPad). Which one of the following would you recommend:
>
>ASP.NET
>Silverlight
>WPF
>
>TIA?