Ubuntu Learning - this is a group focused on trying to develop courses for new users. The courses will be wiki/forum based, irc based or a combination of both. They also have a materials page that may be useful.
Tutorials and Tips forum area - this is an area of the Ubuntu Forums that is moderated (the posts are approved) and is filled with a great deal of useful information. They also have a Tutorial of the Week thread which is a stickied thread of the best of the best.
Edubuntu - "Ubuntu" is an ancient African word, meaning "humanity to others". The Edubuntu Linux distribution brings the spirit of Ubuntu to schools, through its customized school environment. The current version of Edubuntu is aimed at classroom use, and future versions of Edubuntu will expand to other educational usage, such as university use.