Microsoft recently released two exciting technologies for building interactive web applications, and these can easily be leveraged from PHP. First we'll explore using the Microsoft AJAX Library with PHP. You'll see how this client library extends the capabilities of “plain” javascript to be more object oriented, and how to create PHP services that can be consumed by your browser side code. Then we'll introduce Microsoft Silverlight, a cross-browser/platform/device plug-in for delivering rich interactive functionality in browser applications. We'll introduce the different releases of Silverlight, and explore the various programming models for building Rich Internet Applications (RIAs) from within PHP applications.