Though I don't have a great deal of interest in this one particular course, Codeschool is all sorts of awesome. The breadth of (relatively modern) languages/technologies they cover allows everyone to enjoy a piece of the site (although they obviously lean toward the Ruby/Rails crowd). Envylabs really pours a lot of love into the courses and it shows. At the end of their courses you feel (or at least I did) as if you just did half an O'Reilly book in an hour and are ready to take on the world.