ViewTube

Looking to learn about graph theory, calculus, and discrete mathematics?  This channel is for you!
In each video, Dr. Drake takes you on a journey into the depths of mathematical content - guiding you to learn about such topics as Ramsey theory, vertex transitive graphs, partial derivatives, quadric surface, proof techniques, and so much more...
You can watch one of his playlists in order, following along one his courses which he teaches at Purdue University Fort Wayne, or you can pick and choose content that piques your interest.
Dr. Drake also has a blog, Journeys into Chaos, that features learning activities, esoteric mathematics, and notes from the margin.  You love it!