The award winning iLearn Technology blog by Kelly Tenkely is one blog to add to your Google Reader account. This extensive blog exposes many useful tools, but the best part is the explanations of how the tool can be used in the classroom and integrated into existing units of work.
Kelly Tenkely explains her background on her about page:
1 year as a 2nd grade classroom teacher, 6 years as a k-5 technology specialist/teacher. Currently I am teaching 3-5 grade technology and acting as technology integration specialist and instructional coach for elementary teachers
Kelly has also developed the fantastic idea of forming a blogging alliance. Here members commit to reading and commenting on a number of each others blogs on a regular basis. The alliance has introduced me to a number of excellent blogs that I may never have found otherwise as well as providing ongoing mentoring for me and the Bright Ideas blog.
You can find Kelly on Twitter at http://twitter.com/ktenkely.