Look for LNCS 8374.
View the Euro-Par 2012 best papers issue.
View the Euro-Par 2011 best papers issue. The journal CCP&E now also offers a virtual collection of recent Euro-Par best papers issues (from 2007 on).
From now on the Euro-Par proceedings will appear in the special subline Advanced Research in Computing and Software Science (ARCoSS) of the Springer Lecture Notes in Computer Science (LNCS).