I was directed here from Homebrewtalk.com. I was directed to Homebrewtalk.com from Treasurenet.com. It's pretty much those two, although now I am registered here. Treasurenet is a forum for any kind of treasure hunting you can think of although the big activities of most on there have to do with metal detecting, coin roll hunting and bottle digging. I have the same screen name on all the forums.
I came here from homebrewtalk.com. I think that site, along with firearmstalk.com, are run by the same guy/group.
Other than HBT, I really don't follow too many other forums. Spend most of my time online either following a couple different blogs (Three Idiots on Sports for my fix on Syracuse sports and a couple other random beer/brewing blogs), looking for deals on sports/computer/brewing equipment on eBay, or designing mini software apps for myself (such as the softball stats database I'm building now...)