For a long time I've been eyeing Jelani Nelson's Advanced Algorithms class. It's taken me a while to convince myself I was prepared to understand the material, and it's taken me even longer to convince myself I had the time to get back into self studying computer science courses. Per my usual MO, I'm supplementing the lectures from Nelson's class with some lectures from MIT on the subject, though those have more of a bootleg feel to them. Hoping it will be quality content nonetheless.
The goals of the course are to look at different ways to analyze algorithms, and use different "models" to think about algorithms.
Harvard COMPSCI 224:
MIT Advanced Algorithms (6.854):