National Organizations
American Association of School Librarians. American Library Association, 2011. Web. 23 April, 2011.
I would consider the AASL to be the most important professional organization for school librarians. This site provides a lot of essential information for school librarians, including standards, toolkits, links to journals, and so much more. I've used this site extensively over the course of this year, including to help with an advocacy presentation for my principal, and I'm sure I will continue to use it in years to come. I first began using this site when I took Information Inquiry for School Teacher in 2009. The strengths are the sheer amount of information and its authority, while it's weak organizationally.

Association for Educational Communications and Technology. n.p., nd. Web. 23 April, 2011.
This is a professional organization for technology educators in many different fields. It provides information about membership, conferences, publications, and jobs. I learned about this organization from Kym Kramer in the School Media class, and I think it will be useful in the future, especially for information about conferences. There is a lot of information on this site and that there are many perks to being a member, but the site is pretty outdated and that's worrisome coming from an organization about communication and technology.

International Society of Technology Educators. ISTE, 2011. Web. 23 April, 2011.
ISTE is a professional organization for technology educators. I've heard about ISTE because of their standards, which I learned about in Information Inquiry for School Teachers, but I didn't realize it was also a professional organization. This site provides information about the organization and its benefits, information about the ISTE standards, and information about conferences. This is a very well-designed and informative website, but besides the information about the standards, I don't know if I would use it all that often.