Also check out gitit (http://gitit.net), written by the same author as pandoc. It's a git-backed wiki that uses pandoc to let you write in a variety of formats. Markdown + latex for math works well for taking notes in a wiki format. The content is stored as flat files in the repo that you can just export as pdfs using pandoc if you wanted to.
Yep.I use pandoc to convert all the notes I take to a variety of formats for all my different devices and needs. For example Pdf for highly consistent and pretty viewing on a tablet, html as an all around backup, and others as needed. Pandoc is fantastic!
