Working through the first twenty or so lessons from Zed Shaw's Learn C the Hard Way has been interesting but slow going -- a completely open-ended autodidactic mode is pretty difficult to maintain.
To review some algorithms, I've joined Sedgewick's recurring Algorithms Part 1 on Coursera. I gather that this class is more focused on implementation details and the specifics of programming in Java than Tim Roughgarden's excellent algorithms classes on Coursera, which uses CLRS and tends to focus more on reasoning about correctness and complexity. The contrast should be quite interesting. I haven't written in Java since working with Processing, so this should serve as a good language refresher as well.
