Coursera has a couple of courses on algorithms that would be acceptable for beginners but also very challenging (in a good way).

MIT OCW's Intro to Computer Science and Programming (in Python) covers a lot of ground related to programming (more than just Algos), but it covers some essential sorting algorithms and eventually gets into dynamic programming. I don't think anything much simpler than this would be worth your time (not to say this is the best), but the readings themselves (especially those from wikipedia) can actually be a little dense: http://ocw.mit.edu/courses/electrical-engineering-and-comput...

MIT OCW also has a full course on algorithms.