The Pennsylvania Bulletin and the Pennsylvania Code recently became available on-line at: http://www.pabulletin.com and http://www.pacode.com. Both sites are free and fully searchable.
The Bulletin is published each week and contains official notices by all state agencies that give the public the opportunity to comment on proposed regulations and policies, proposed permit applications, and notice of other official documents. PABulletin.com can be searched by keyword and date and contains Bulletin editions back to 1996.
The Code is the official set of regulations and policies published by state agencies and contains over 40,000 pages of text. PACode.com can be searched by chapter citation and keyword.