We spend a lot of time here focusing on vBulletin, phpBB, IBP, and other existing forum solutions.

Elsewhere people are focused on large Internet communities such as Facebook, and MySpace.

SecondLife and Entropia are Internet communities also, but based around graphical user interfaces and attempting to replicate "real life" online.

Kaneva is an interesting mix of features from SecondLife and MySpace.

When I look at these options, I see a bit pattern:
(00) General communities, old style (Facebook, MySpace)
(10) Niche communities, old style (vBulletin, phpBB)
(01) General communities, new style (SecondLife, Entropia)
(11) Niche communities, new style (big blank space here)
Has anyone looked into what would be necessary to create a niche social community providing features like SecondLife?