There are three great websites that I would like to share with everyone:
eduTecher.net - A website run by Adam Bellows, an awesome educational blogger and speaker. I saw him at ISTE 12 in San Diego. His website has fantastic links and resources that everyone can use. If you're looking for an educational website, search through his directory first. It's worth the time.
Socrative.com - Finally a FREE (at least for now, it's currently in beta) way to quickly assess your students! Since I have a computer lab, it's SO easy for all my students to log into my room (no complicated uploading of user names, passwords, ID numbers, blood samples, pictures... you get the idea) and answer a few questions for me. Comes pre-made with a easy to use EXIT TICKET for quick assessments. Also, allows you to create your own tests, quizzes, etc. For people without one-to-one device environments, students can use their own cell phones (check your districts policy on this one, though) or it's easy for students to switch in and out too.
If you use them - let me know how you liked them!