A number of Catholic Cemeteries under the Pgh Catholic Cemeteries Association now have their burial records online. Go to the Associations Cemetery web page at:
http://www.ccapgh.org/html/Cemeteries/020.html

On the left hand side you will see a list under their phone number, click on Cemeteries.

then click on Obituaries

You can search by a specific cemetery or search all of them at once.

I found this by chance, because no where (that I can see) do they have any notation for "burial records" .