On December 28, 2010, the Pennsylvania Unified Judicial System published online the legal holidays to be observed in 2011 by all employees of the appellate courts and the Administrative Office of Pennsylvania Courts. The schedule also listed local legal holidays of the sixty-seven counties in Pennsylvania, which vary surprisingly (mostly around the end of next year).
The statewide court holidays are not a recently released secret -- the holidays were identified in the Pennsylvania Bulletin on January 6, 2010, 40 Pa.B. 525, under an Order of the Pennsylvania Supreme Court.
The recently-issued compendium of Pennsylvania 2011 County Holidays (PDF, 2 pages) integrates those holidays with additional local ones.