American Hatpin Society - http://www.americanhatpinsociety.com/
Dedicated to the collection and preservation of antique hatpins and hatpin holders.
BookScout Pro - http://www.bookscoutpro.com/
Get real time book prices on your cell phone or PDA.
Coin Update - http://coinupdate.com/
Offers daily news, articles and information on coin collecting. Also features newsletter, interviews and archives.
Collector Network - http://www.collectornetwork.com/
Features links for coins, cards, and stamps collectors.
Collectors Society - http://www.collectors-society.com
Supports collectors across the world by providing members with exclusive resources and showcasing remarkable collections.
Pottery Studio - http://www.studiopottery.com
A knowledge base for collectors, students and lovers of all kinds of pottery.
Silver Coins - http://www.silver-coins.org/
Helps coin collectors from around the world to identify counterfeit coins. Also includes articles, and FAQ's.
Stampdir - http://www.stampdir.com/
Directory for stamp collectors and stamp dealers.
StampLink - http://www.stamplink.com/
Designed to promote philately by leading those collecting stamps directly to relevant philatelic sites without search engines.
StampListing.Com - http://www.stamplisting.com/
A philately web portal dedicated to the world wide stamp collectors.