Blogoforum
Blogoforum is the first fully tag-based discussion forum that I’ve seen. It eschews sub-forums and categorization for tags, and any post can become the start of a new thread. Interesting (and a bit chaotic). Looks like Vennt will be doing something similar…

August 3rd, 2006 at 5:09 pm
I’m working on my own system called OneLobby (http://www.onelobby.com) that is based on a very similar concept. However, I plan to release it under GPL or MIT.
August 3rd, 2006 at 5:16 pm
I look forward to seeing it and reporting on it here! Let me know if you need a beta tester
August 23rd, 2006 at 7:51 pm
Hey,
you can check out a beta of OneLobby at http://dev.onelobby.com. I suggest you register and explore a bit (no email validation required). Lot’s of the old threads will reveal some of the not so obvious features. Enjoy