Well, I also updated this app now that Silverlight 2 has RTW'ed. The performance improvements we've made in Silverlight are truly stunning. I will reserve the details for a later blog post, but one of the things that deep zoom always does is blend the various levels of detail as they become available over the network. Now if you use Virtual Earth data, as it is the case in the example below, well when you zoom in really fast and the network isn't as fast as you are with the mousewheel, then you may end up having to blend a lot of levels of detail.
Needless to say, even if we have to blend 8 or more layers at the same time, our performance does not drop anymore. We keep up a very high framerate and that's definitely a great thing!
As usual, you can get the Source code here.