You probably know Internet Explorer Test Drive, where you can find several developer demos on the different features in HTML5. It’s also the site where you can find the Platform Preview for Internet Explorer 10.
Now, with Internet Explorer 9 coming to Windows Phone ‘Mango’, the IE team has created a special version of the site and samples for optimized testing on IE9 mobile: Internet Explorer Mobile Test Drive. There are demos on HTML5, performance, graphics and browser theming.
By downloading the free Mango tools you get an emulator that you an use today to access the samples.