As a teacher, I find myself constantly trying to learn more, find new ideas and keep on top of all the current, latest methods of teaching. Right now, these are my three favorite websites as a math teacher. The NCTM website is a good resource for looking up the latest ideas in mathematics, current research, national standards, etc. NetTrekkers is a great resource for lesson plan ideas, teaching strategies, etc. But out of all three, Discovery Education is my favorite. I'm always looking for new, creative ways to present concepts to my students. This is a video archive which has an educational video on just about anything. You name it, they have it. The videos range from about 5 minutes to 1 hour. Some of these videos are a great alternative to the traditional ways of explaining concepts.
The only slight problem with these websites is that you have to be a member in order to access all the useful information they have. I was lucky enough to have access to them either through UAS or the school I work at. However, don't worry. Chances are your school may very likely have access to these websites as well. A good person to ask would be your department chair or maybe even the librarian.
