Most if not all have resources you can use. You can also subscribe to blogs you like. My first pick is Larry Ferlazzo's Websites of the Day at Edublogs. In addition to English, you will learn a lot about the world, current events, important issues and many other topics.
More to look at: About.com's list of Best ESL EFL Teacher blogs. Do you have a favorite ESL blog? Please share it with us?