This website is great for both teachers and students. It has millions of primary sources from U.S. history. It works for research or even simply as a lesson starter with an interesting photograph.
This is a nice web newsletter, full of very practical classroom tools for educators. Dulcinea is a character from the Man of La Mancha (Don Quixote), who had troubles finding the good in herself. This appears to be an effort to find the 'goodie' in instructional technology resources.