This site from Drexel University was one of the earliest comprehensive math sites. It has many resources for teachers and students. This particular page is for teachers, but there are student pages, "What's New" pages, and more.
This particular Richard Byrne entry describes a pearltree used to catalog some useful tech resources for teachers. You can learn about the resources and pearltrees in the process.
Teachers Love SMART Boards provides resources for teachers who use Smart Board interactive whiteboards in the classroom. (Includes pitches for buying their training)
Great site from a teacher I've "known" for years online. This is her page for a presentation on using googlesites. Teachers (and students) will be able to create their own websites.
Welcome to the TESiboard collection,a purpose built library of visual, dynamic,interactive resources.TESiboard resources are primarily openendedtools that enable teachers to enagagetheir pupils in a learning dialoguearound the resource.The resources are designed for use by theteacher on their interactive whiteboardbut many are also suitable for pupil use,usually responding to a task or challengeset by the teacher.The TESiboard materials were acquiredby TSL Education Limited at the end ofNovember 2009 and as a result of TSL'scurrent and planned future investment,all these popular resources are availablefor free.
This site is from the UK. You can also follow them on twitter, @TESconnect
Great teacher blog. Great way to develop a culture of readers. Like idea of students posting what they've read/are reading. Whatever Wednesday. Friday book trailers.