I found myself recently with a lot of free time on my hands, so I decided to brush up on everything hacking related. Out come Skiena's "The Algorithm Design Manual", Sipser's "Theory of Computation", Axler's "Linear Algebra Done Right", and plenty of other stuff I never knew or already forgot. I want to organize all of that into some method as it was once done in college: schedule, assigned readings, problem sets, etc. except this is all self-imposed. What nifty Web 2.0 tool can I use to do this? A To-do list like "www.rememberthemilk.com" doesn't seem adequate - I think I would like a more rigid setup.