Via the 9 (she’s a bit scary herself), here’s a site dedicated to documenting ghost towns:
This is our photo collection of more then 1300 pictures from 174 ghost towns and historic places in the United States.
Here you find photos of:
- western towns, sometimes completely abandoned, sometimes still lively
- old gold mines
- old mills, where the ore was processed
- old cemeteries
- and much more
What about Canadian ghost towns, you ask? The Intarweb is more than happy to oblige. Plus, of course, there’s always Flickr.
DarrenBarefoot.com 
Damn, no ghost towns of Quebec. I know of a few, but they’re too far north for me to go on a week-end hike. 😉
The ever-interesting googlesightseeing blog featured a completely empty island in Ontario a week or so ago:
http://googlesightseeing.com/2006/08/30/cockburn-island-island-week/
It inspired me to read up on some of the abandoned mining towns here in BC. Perhaps a wild party and/or walking around naked is in order?
How about Phoenix? An old mining company town near Greenwood off of Hwy 3 heading East into the Kootenays. very weird, when they closed the mine the dismantled the town. The roads and foundations of the houses are still there though, as is a WWI memorial. I always wonder if it will come back one day (what’s in a name?)
photolink:
http://www.flickr.com/photos/hamhockracer/211958530/in/set-72157594232172605/
(excuse the lazy link)