You could find the release notes here: http://www.telerik.com/products/silverlight/whats-new/release_notes/q3-2011-version-2011-3-1116-3042891080.aspx.
Let me know if you have any problems again.
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Indeed you are right. It seems that there is a problem with the RSS feeds that we need to investigate.
Meanwhile you could use this link to access the release notes:http://www.telerik.com/products/silverlight/whats-new/release_notes/q3-2011-sp1-version-2011-3-1220.aspx.