A free computer-programming course on reddit. Click "prev" for more lessons. 113 lessons so far.
posted by grumblebee on Oct 24, 2009 - 89 comments

A free website that helps you learn to diagnose and work through negative though patterns. Having seen so many posts on AskMeFi about depression, anxiety and related topics, it seemed almost a duty to share this. It's a free website (well, you have to register but it's anonymous and no cash changes hands) that's run by the health service here in the UK. [more inside]
posted by KMH on Oct 20, 2009 - 27 comments

Douglas Hofstadter's Gödel, Escher, Bach: An Eternal Golden Braid has been recorded as a series of video lectures for MIT's Open Courseware project.
posted by loquacious on May 30, 2009 - 74 comments

"The world's longest and hardest mouse agility course," brought to you by these guys. Don't forget to browse the gallery of cute mouse and rat pictures.
posted by MaryDellamorte on Dec 7, 2008 - 23 comments

At One Minute Languages you can learn greetings, talking about names, counting, and more in Catalan, Danish, French, German, Irish, Japanese, Luxembourgish, Mandarin, Norwegian, Polish, Romanian, and Russian.
posted by sveskemus on Nov 11, 2008 - 25 comments

Free math courses online, from very basic to brainiac. [more inside]
posted by nickyskye on Feb 26, 2008 - 19 comments

Do you love learning? I know you do. This might help keep you busy for a while.
posted by loquacious on Jan 13, 2007 - 44 comments