I started using OneNote my last year of school and thought it was perfect for the task. I'm not sure it's strictly superior to a personal wiki, though it's arg

I started using OneNote my last year of school and thought it was perfect for the task. I'm not sure it's strictly superior to a personal wiki, though it's arguably easier to set up and arguably has a better UI. If you don't have Office, the web-based OneNote at http://office.live.com http://office.live.com might work for you, though I haven't used it much (and I suspect it won't support entering of equations).