The Resource for Education Technology Leaders focusing on K-12 educators. Site contains a Software Reviews Database, articles from Technology & Learning Magazine, articles from Educators in Educators' eZine, Event and Contest listings, Reader suggested Web sites, and weekly news updates on education technology leaders.
A Site worth looking at for Elementary, Special Education, and ELL students. Some of the tools might be a bit pricey. Look at the Blog and seriously think about an RSS feed. The links to resources are awesome.
LiveBinders - looks like a good addition to Diigo Free. For over 13 years of age - perhaps a great tool for students and for creating a common place for integrated learning projects
Post comments on a wall - think of it as a series of Post-Its on a board which everyone can see. One can moderate comments or not - depends on the question you're asking. There's some limited ability to customize the look.
Links to a number of Conceptual Units, especially Literature and media - a number are in IRA's Read Write Think site which also has links to state standards. A work in progress.