This is a really good Canadian site. It is based on positive discipline. There are four categories, one which is based on subs. The last category is a listing of FREE resources. This site offers management techniques for the classroom.
Teachers write in their different ideas.
All the materials and procedure for doing the tips are clearly outlined. Also link and different categories to using the internet in an elementary classroom. This is a good site. Has links from classroom organization to special projects. One of the links is for some great icebreakers and games.