Great thread. Those links'll go straigt on ahead to my ref-bookmark-folder.
Here are some different Urban exploration and similiar stuff links. Hope you don't mind
http://oboylephoto.com/ruins/index.htm
http://www.pbase.com/jakobe/decay
http://www.pbase.com/crourke/ue
http://www.pbase.com/robin_r_mitchell/abandoned
http://www.pbase.com/giordanoitaly/psychiatrichospital
Edit: forgot to add this one:
http://www.urbanized.us/
I know the last four are all from pbase.com, but they're all worth checking out
