From the article: "DoS mitigations are implemented in current internal builds and will ship with Silverlight 5 RTM." - Microsoft This issue is already address

From the article: "DoS mitigations are implemented in current internal builds and will ship with Silverlight 5 RTM." - Microsoft This issue is already addressed. It's a non-issue being drummed up by Microsoft competitors. Even John Carmack agrees with Microsoft about WebGL.