Free Technology for Teachers. Even if they weren't an advertiser there is still a good chance that I'd mention this contest.
The Worth Ave Group is currently sponsoring a contest through which schools in the United States can win technology prizes worth up to $25,000. Here's how it works: a teacher is nominated by a community member and is then placed on the contest's list of eligible nominees. The teacher who receives the most votes will win a $25,000 technology prize package for his or her school. The contest will also award smaller prizes to five runners-up. Voters will also be entered into a random drawing for iPads. The voting is open now through the end of March, 2012. You can read the full contest rules here (link is to a PDF).