I really like anonymous discussion systems, and think they have the potential to thrive just as well in the West as they have in Japan. However, in order for that to happen, the core functionality needs to be adapted into a modern, logical layout that doesn't confuse the hell out of newbies.

I'd also like to see more user moderation features, like post/thread ratings and tagging. Some sort of searching and customized thread-sorting would be nice too. Altogether, it would remove the need for separate, admin-controlled boards as well as the awkward "sage/don't bump" function.

Finally (and this is probably the most controversial change), I'd like to get rid of names and tripcodes and simply use rotating ID hashes with strong proxy detection to stop IP spoofers.

In actuality, I've had the idea of starting my own anonymous experiment for quite a while, but have been unable to as I don't know PHP, Perl, Rails, or SQL and quickly find myself overwhelmed. :(