From a Pennsylvania Game Commission press release via PRNewswire:

The Pennsylvania Board of Game Commissioners today voted down a proposal that would have placed restrictions on crossbow use for the 2009-10 seasons. The 4-4 tie vote is not sufficient to give the proposed rulemaking the final adoption needed, so the previously approved regulations governing the use of crossbows for the 2009-10 seasons — as outlined in the 2009-10 Digest — will remain in effect.

In other words, crossbows will be legal for the entire deer and bear archery seasons.