People seem to use my City of Pittsburgh voting districts in a google maps overlay. Same for the remainder of Allegheny County. But then you probably want to use the Allegheny County Polling Place locator to figure out where to vote assuming it's up to date.
Some past election maps are here... also here on our PNCIS site to zoom around interactively for things like the last presidential race.
Also I see Mattt's Demograph tool is still online allowing you to figure out what voting districts are relevant for your address.
And I have compiled historical City of Pittsburgh election data. (excel file... I tried to put into a google doc but it won't let me.. I think it has too many columns?)
I'm probably forgetting a lot, but 3 days and change. Vote em if you got em.
update: and I forgot this...but I had my own interactive map of the results from the 2007 Ravenstahl-Desantis Mayoral race which still seems to be working online here. So we will benchmark what happens on Tuesday versus that maybe.