http://www.teachinghacks.com/wiki/index.php?title=Main_Page
This wiki is chock-full of good information for teachers. There is a "what's new" section where you can see the latest additions to the wiki, and these can vary from blog posts to lesson plans to teacher education information. There's a column of the main sections of the wiki so you can go directly to what you are interested in. One of the more fun things on this wiki is the "random page" link, which will bring you to some page of the wiki, but what it will be about you won't know until you click on it. I did it twice and got one page about using a case study in a lesson, and one about using blogs to help students who are learning English as a second language.