In December, the Post Summit Paper by Christian Bizer, Peter Boncz, Michael Brodie and Orri Erling has been published in the newest volume of SIGMOD Record.
Orri Erling blogged about the 2011 STI International Summit and the history of Semantics and its future. His blog post can be found at http://www.openlinksw.com/weblog/oerling/?id=1694.