If you've been itching to learn photography but aren't sure where to start, former Stanford professor and Google teacher Marc Levoy has released his entire course, which includes video lectures and slides online for free. The class is set up like any university class would be, with two classes a week and each class covering different topics, from the basics of image formation to lighting. Each week also has a bit of history mixed in alongside assignments to keep you occupied. The course isn't set up for a ton of users, so if you run into a problem loading anything, this workaround should help with the slides, and Levoy's YouTube page has all the videos.
Lectures on Digital Photography [Marc Levoy via DIY Photography]