Silverlight is often compared to Flash, and rightfully so.  Principles such as a cross domain access policy and animation techniques use the same principles.  Even on the application architecture side of things, similarities exist (for example the Caringorm pattern has been ported over to Silverlight). 

Tsang Terence at Shine Draw does a great job of not only showing side by side examples of Flash and Silverlight applications, but he makes the code available as well.  This is a must bookmark Silverlight site.

One of my personal favorites is Tsang’s demonstration’s is showing the differences between Flash’s Enter frame and Silverlight Composition Target - http://www.shinedraw.com/mathematics/difference-on-timer-enter-frame-dispatcher-timer-and-composition-target/