Hi Justin,
I don't mean to toot my own horn, but my blog is a pretty good starting point: Props | Making and finding props for theatre, film, and hobbies
There is the Props People forum, which sadly has become neglected and sees little activity these days: http://forums.delphiforums.com/proppeople/
We've been talking about creating a new forum with more of a moderator presence, but that seems to have stalled. By we, I mean S*P*A*M, the Society of Properties Artisan Managers. You can check out the website at Welcome to the Society of Properties Artisan Managers. Though the list is closed to members, we do have a mentoring program where you can find a member closest to you for everything from internships, to just exchanging emails to chat or answer a few questions.
If and when there is a new forum, you can be sure to find it on my blog, until then, check what I have up there and follow the links to see what else is out there.
-Eric