.

Achate.at (German Agate Site) 
Achate-Almanach.de (Agate site at Germany)
Arizona Mineral Company(been buying putty and arcylic bases from) 
Argentina Agates, gallery of agates found around Argentina
Agates.Eu (European Collection Exhibition) 
Agatesaustralia.com
AgatesGrrrl.com (agate collections and books on rocks, minerals and stuff)
Agates from Argentina
Agates of the World
Agates from Italian Island of Sardinia
Arizonaagates.com, Patrick Thomas's website devoted to agates from Arizona, a friend of mine. :)
Beautiful Agates.com (Micheal Carlston's site)agate gallery and agates for sale. 
Bill's Rock Hill Homepage (Bill's collection of Union Road Agates) 
Da Yooper's Guide to Michigan Gold
Gem Shop Inc., mines and sells agate roughs 
Cooloola Rocks & Minerals, Australian Minerals and others. 
Condor Agate Museum
Crystal Caves (online shop) 
Czech Agates website:
CyberRockhound.com, lapidary stuff for sale 
DaYoopers.com, includes a rock shop specializing in rocks from Upper Peninsula of Mcihgian. 
Earth Relics Jewelry Company Ready to Wear stone pendants
Eibonvale Thunderegg Gallery, gallery of thundereggs from around the world.
Euro-Bir, has a gallery of Turkish agates
Fairburnsuperagate.com, gallery of Fairburns
Fascinating Agates and Jaspers (Johanna Zenz's website)
Gitche Gumee agate and History Museum by AgateLady of Grand Marais, Michigan
Hinkle's Rock Shop, specializinag in Oregon thundereggs
Hungarian Agates,
Kentucky Agate Collecting
Killer Agates!
Kingsleynorth.com, lapidary stuff 
MapMuse.com 's Directory of Rock Clubs and Rock Shops.
Maria Magic Net (has articles on agate huntings)
Mineralogy Database
Mineral-Tivadar Hungarian Site
Miner's Kingdom
MoonlightGemstones.com, Specializing in West Texas Agates and other gemstones. 
NawbinBeads.com, one of largest bead shop in Michigan! 
Paul "Geode Kid" Colburn's Baker Egg Mine Website
Polished Agate Mosaics Gallery of mosaic art made from agates.
Rocks for the Hounds
RockStoreOnline.com, online store
Snobappealjewelry.com,
Scotland Agates
Slaskie.agaty.prv.pl (Polish Agates & Thundereggs)
Spanish Stirrup Rock Shop (near Rockhound State Park), New Mexico agates & thundereggs
Sunshine Candles (Agate Candles)
Temple of Stone,a friend of mine. :)
Tennessee Paint Agates website
Thundereggs, Geodes, & Topaz by Loren
UofNB:Conservation & Survey Division. has Agate Database