Collecting Forums and Message Boards
Collector Café
http://www.collectorcafe.com/

National Association of Collectors
and the Association of Collecting Clubs.
http://collectors.org/GL/

The Collector's Society Message Boards
http://boards.collectors-society.com/ubbthreads.php

Collectors Forum
http://sacmoney.com/cwforum/forum.cgi

World Collectors Net
http://www.worldcollectorsnet.com/boards.html

Specific Collection Websites
Gas Station Memorabilia
http://www.oldgas.com/roster/nd.html

North Dakota Pottery Collectors Society
http://www.assumptionabbey.com/Pottery/
NDclay/CollectorsSociety.html

Golf Ball Collecting
http://www.advancenet.net/~klharney/listinfo.html

Miniature Shoe Collecting:
http://collectibles.about.com/cs/therightshoe/

1950s Memorabilia:
www.rockn50s.com