Here is a list of popular treasure hunting and metal detecting forums (in alphabetical order).  They are all clickable links!  If you have a favorite that I have left out, please email me at danhughesmail@gmail.com so I can add it to the list.

GENERAL FORUMS

American Detectorist

Find's Treasure Forum

Friendly Metal Detecting Forum

Lucky Dan's Metal Detecting Forum

My Treasure Spot

THunting

Tom's Treasures

Treasure Depot

Treasure Digging

Treasure Hunter Forum

Treasure Quest Metal Detecting Forum

World Metal Detector Community

 
REGIONAL FORUMS (Most of these welcome anyone, whether you live in the area or not)

Canadian Metal Detecting

California Metal Detecting

Great Lakes Metal Detecting

Metal Detecting Maine

Metal Detecting New England

New Hampshire Bob's Metal Detecting Forum

Northeast Metal Detecting Forum

 
MAGAZINE-SPONSORED FORUMS (You do not have to subscribe to participate)

Lost Treasure Magazine Forum

Western & Eastern Treasures Magazine Forum

 
SPECIALIZED FORUMS

Geotech Technology Forum (Mostly technical discussions by technicians/engineers)

Nuggethunting Forum (Mostly prospecting, but this is their treasure hunting page)

White's Electronics (discussion of White's detectors only)

 
NEWSGROUP FORUMS (These use email addresses, because you send your notes via email)

(Go to http://groups.google.com/ or http://groups.yahoo.com/ to join)
alltreasuretalesusa@yahoogroups.com (mostly concerned with Big Finds)
alt.treasure.hunting@googlegroups.com
metaldetecting@yahoogroups.com (lots of spam)
metaldetecting2@yahoogroups.com (lots of spam)
metaldetectingfamily@yahoogroups.com (excellent group)
treasurehunter@yahoogroups.com (lots of spam)

For more of my articles on metal detecting and treasure hunting, visit http://treasuremanual.com.