Old Haunts is a neat web site that includes old photographs of Halloweens long past. Lots of cool stuff.
I wish someone would do a wiki or other collaborative site to compile this sort of thing. I really enjoy looking at vintage stuff about Halloween, Christmas, etc. A few years ago I even bought a couple of 60s era Sears Christmas catalogs off of eBay just to look at all the stuff I used to long for as a kid.