"I have to split my time between xmarks, a hunting forum, a motorcycle forum, and a homebrewing forum."

That's it? Lemme see...
I belong to Xmarks, 5 motorcycle forums, 3 video game forums, Sword Forum International, the forums at Silenthillheaven.com, the Magic the Gathering message board on the Wizards website, the forums at Fordfestiva.com, I used to use some Anime/Manga forums but haven't visited in a long time...
OK... yeah... junkie. Needless to say, I am more active in some more than others.
If you do a random search regarding your hobbies... I am sure you can find a forum for it!