Richard Byrne has a great blog called "Free Technology for Teachers." In his blog, he talks about free technology resources for educational use. He also links to a wiki page with tons of resources. I'm really impressed with his list of resources and I suggest all teachers take a look at what he has listed.
I really like his post about Copyright issues. In this post, he embedds a great slideshow explaining educational copyright issues. I suggest that all teachers read this post.