I've been sitting on this awhile, but I need to throw it out there. There is a new website called Nurse Linkup, that appears to put a professional face and focus on the 2.0 space. Since I work in a healthcare organization, I can tell you that nurses are highly fragmented but also that there are like a gazillion of them (all numbers approximate). The community is run by a for-profit company, itLinkz, based in Pennsylvania. So this is an interesting thing to throw out there. I'm gonna try to interview these folks one of these days. Seriously, I have to respect this. Associations are cool, our members are cool, and if there are other models that serve them, we need to be accountable in the marketplace.