I'm a teacher librarian & recently started a community based blog for getting boys to read - http://GettingBoysToRead.com. Please send me a friend request if you'd like to network, share ideas, and learn more about getting boys to read.
I can't say that I use this site much myself, obviously. However, I apparently still get email notices if someone leaves a message.
For me, this was one of many experiments that people have tried. In the early days of this Ning community, I was getting friend requests for a bunch of folks who were only interested in building their lists of friends, and not really in Library 2.0 stuff. I deleted a few of them, but I think it turned me off of the site and I had forgotten about it. At the moment, I am more into reading a finite number of blogs that I like and leaving comments if I have something to say. However, if the site has lost its hip newness factor, I suspect the people still using it are really interested in library 2.0. So maybe it is better now.