I have been a huge fan of Academic Earth for quite some time. For those not familiar with the page, I wanted to highlight some of my favorite material from the site. Academic Earth features full length video for a number of useful/interesting courses. If you simply are interested in absorbing the content, it is a great way to learn. It is arguably better than site such as MIT Opencourseware as it has the full video (MIT Opencourseware often just has lecture notes).