Find here a review of many "niche" social networking sites.

first, anybody want to check any of these out?
Secondly, can we get on this list?

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Deepgeek

It is amazing how quick niche social networks have grown. I am attempting to review, catalog, and monitor these sites. Below is an ever growing list of niche social networking sites. (I am including sites that are built on community building sites like Ning.) Also I have included links to my review of these sites so you can help determine where you want to build a profile and participate. If there isn’t a review I just haven’t gotten to it yet… This list will be continually updated and tweaked.

Niche Social Networking Sites from Social Media Answers