There are a lot of different ways to learn online — iTunes U, Khan Academy, even simply watching videos on YouTube can give you access to useful information. Recently, a good friend recommended Coursera, where you can take courses from Princeton University, Stanford University, University of Michigan, and the University of Pennsylvania. It’s not only video lectures, there are also quizzes and peer grading.
I had a look at the Human-Computer Interaction course by Scott Klemmer (Stanford University) and it looks really interesting. Unfortunately, it has already started, but you can still see the videos and take the quizzes.
There are some interesting courses which start later this year — very interesting if you want to have some more structure while learning something that might help your creative projects.