Abandoned Pittsburgh Sources

Here are some sources I've found detailing information on urban decay and abandoned buildings in Pittsburgh:

BootsnAll: This travel website posted an article called "Guerilla Tourism in Pittsburgh", a guide to spots like the Dixmont Insane Asylum, steel mills, and the Church Brew Works, all places which have been long abandoned (and, in some cases, reopened as completely different things).

Historic Pittsburgh: A very extensive list of the most interesting abandoned buildings in Pittsburgh, endangered buildings, and other historic places.

Fiveprime: A really cool photo gallery on the photography search engine with dozens of pictures of abandoned buildings and houses in the Pittsburgh area.