A message on the Pennsylvania State Archives web site at http://goo.gl/COhA states, "The State Archives research room will be CLOSED for renovations beginning on Monday, October 18th, 2010. We anticipate reopening for public use on February 3rd, 2011."
Note this refers only to the State Archives research room, not the entire archives. However, that room is where perhaps 99% of the genealogists would go to find information so, in effect, the Pennsylvania State Archives will not be useable for genealogy purposes until February 3rd.
