Well - I don't know if it is proper form to "answer" one's own question, but I thought I would post a quick update.
"Christmas morning" arrived around 11:30 PM (Eastern Standard Time) last evening, when Ancestry posted the PA Death Certificates online. The one draw back is that they are supposed to make these available to all Pennsylvania residents free-of-charge, but that capability has not been implemented yet.
Still though, from the help of some friends and a quick trip to the library on my lunch hour today, I have already found seven death certificates that are useful in my research.
Most notably, I found a death record for this ancestor that was signed by the Coroner and lists "probable murder" - which is absolutely brand new information for me. Thus - I will be spending an interesting evening looking into the tragic demise of Charles Lennox of Pittsburgh:
http://www.wikitree.com/wiki/Lennox-56
I will update this again if/when Ancestry makes the PA Death Certificates free for Pennsylvania residents, as this is a gold mine of information for people who have PA ancestors from the late-19th/early-20th centuries.