Visit Blue Web'n. According to their website, "Blue Web'n, is "an online library" Their website includes a listing of Internet sites." Information about the sites is grouped together by grade level, format, and content area. The resources from this site is a scoring rubric. One great thing about this site, is that the company that manages this website attempt to keep current. In fact they strive to add additional links to the website on a monthly basis.
See: http://www.kn.pacbell.com/wired/bluewebn/contentTable.cfm for more information on this site.