Ask HN: Where do you store your code notes?

I read a lot of programming books, and I want to store some notes and code snippets all in one place.

I could type them up in my text editor and upload them to github or whatnot, but this is somewhat hacky and can get out of control very quickly (I can only imagine trying to look something could be a pain). Also, github doesn't really seem like a place for notes perse.

There seem to be a million note applications today, does anyone know of anything that would be particularly handy for code/snippets/notes ?