Free-Ed.net
If you are the type where you learned something from high school and now you forgot it, thist sight may help you. This site is like getting a high school education online. It carries text books that you can access online. So if you need to get refreshed on Algerbra, or never took Physics in high school, well you can now read a text book about it. Access to the books are free to use. It's a great place for an online library!