I explored Nings today. I especially liked TexasSchoolLibrariesNing and TeacherLibrarianNing. I joined both of them, but I feel kind of like a poser since I'm not a practicing librarian yet. I found both of these to be useful because you can add events, videos, and job postings. There are also forums, groups (elementary, high school), blogs and a Facebook and Twitter connection capability. I think these are great resources, as they are an excellent way for teacher librarians to connect, share resources and information, and keep a finger on the pulse of the library world.