Great site for grades 3-6. It includes writing prompts, writing lessons, writing traits, writing process, writing genres, and writing across curriculums.
Several different activities that help support students speed and accuracy of letter/sound recognition. Might be great for keeping data in the primary grades!
115 pages of activities for letter and sound activities. Many activities that would be great for centers and/or interventions. All materials needed are included.
I read about this site in one of my education magazines. It has online textbooks that you can use for free. You can also "make" your own textbooks that fit better into your classroom! I haven't been able to play around with it too much, but it's worth a try!