There are a number of bugs in Silverlight that might give you grief. I've compiled a list of some of these bugs as well as their respective workarounds here: Silverlight Bugs and Workarounds. I published this list on a blog page rather than a blog post because our team will be adding more bugs to the list as time goes on and it seemed strange to be constantly updating a blog post; however, I wonder if just using a blog post would make the content more discoverable since it then gets aggregated. Let me know if you have an opinion on this.