First off, if you go to the Bing Maps AJAX site and have Silverlight installed chances are you will be redirected to the Bing Maps Silverlight site (note this change only affects users in the US). We’re rolling this out with a small percentage of users increasing up to 100% of all users in a few weeks. If you don’t have Silverlight installed you can hit the AJAX site and will be prompted to install Silverlight (which you can opt out of, but WHY would you??). Well, to make the AJAX site a bit smoother we’ve introduced some new transitions in the tile loading process for panning and zooming. So you can have your Silverlight and AJAX too. If you don’t want to stay on the Silverlight site, you can opt out and return to the AJAX site (aka Bing Maps Classic) via the link on the Silverlight site.
Bing Maps with Silverlight “gives you added features like Map apps, Streetside view, and What’s Nearby”. More on Bing Maps with Silverlight in our original post from Dec 2.