Here are some useful sites for educational resources.
This website may or may not be operated on a small-time level; it is less professional than many other sources for educational tools. However, while clicking around on the links, I stumbled across all kinds of categories of resources, from Language Arts links to Early Elementary links, etc. Most of these are personal sites of teachers and contain useful activities they have experienced and are tried and true in their own classrooms. This site presents what real-life teachers working with children rely on in order to be effective.
This site is a community directory for teacher resources that includes links to teachers' blogs...ideas for lesson plans...classroom activities...games...etc. Relevant for Elementary teachers grades PreK-8th.
This is the Smithsonian's educational site. Provides lesson plans that you can search by topic, age group, subject, etc. Amazing! Along with the lesson plan, you can click on links to get to additional related resources, such as books to use, coloring pages.....etc.