The Encyclopedia of Educational Technology is a site created by San Diego State University. The site is a great resource for educators, covering all kinds of topics in Educational Technology.
The Table of Contents is set up by category: Cognition and Learning, Analysis, Design, Development, Implementation, and Evaluation. Under each category, there are subcategories, such as eLearning and Multimedia development, with a huge number of resources.
The articles are well-written and to the point.
This is a must see resource for educators using educational technology.