Silverlight Security

A friend at work refered me to this article by Nick Kramer on Silverlight security.

For general security considerations for Silverlight there is no better single source avilable currently. Silverlight really demonstrates how secure a software product can be if it follows a Secure development life cycle process.

Link to the blog post which contains the document and a short into to it from Nick.
http://blogs.msdn.com/nickkramer/archive/2010/03/19/updated-security-overview-for-silverlight-4-rc.aspx