Silverlight Performance BlogSilverlight performance related blog posts provided by the Silverlight performance team members including Mike Cook, Jossef Goldberg and others.
Not sure if folks are aware, but in addition to the Silverlight Spy tool which is a great visual tool to explore your application runtime tree and detect possible perf bottlenecks, there is also a free tool called Silverlight Inspector. Silverlight Inspector is a free utility that lets you view your app visual tree and control/view assemblies within a XAP. This tool is an open source so feel free to download sources and post back your improvements.
Enjoy. Jossef.