There's a nice 3D still photo sharing site that popped up recently:
http://phereo.com/. Similar to YouTube3D, but for photos instead of videos, visitors can select from a bunch of different viewing formats, and the 3D photos can be easily embedded in other sites, although sadly not in phpBB
Dennis, who runs Phereo seems like a great guy.
And, of course, I put up some of my own photos:
http://phereo.com/VRtifacts/
I also wrote a Wordpress plugin:
http://wordpress.org/extend/plugins/3d-pix/, to make it easy to embed 3D Phereo images on your blog.
