I sent a good friend of mine, a fellow DIY weekend warrior, a list of my favorite catalogs to find rare tools. I think there's a zillion things in each one of these that I'd like to add to my tool collection.
Lee Valley (http://www.leevalley.com)
for woodworking, gardening, hardware
Garrett Wade (http://www.garrettwade.com)
like an upscale Lee Valley
McMaster (http://www.mcmaster.com)
has any hardware item you'll ever need
Gemplers (http://www.gemplers.com)
has lots of ag/farm stuff but you can find 'em cheaper elsewhere sometimes
Japan Woodworker (http://www.japanwoodworker.com)
is in Alameda--someday I'll check out their retail store