I've been focused on spiritual growth lately (I'm a practicing Christian... emphasis on the "practicing"), so the journal is mostly thoughts and insights brought up by praying and reading the Bible. It's usually pretty informal... I miss a lot of days, and plenty of my entries are just a sentence or two.

I've been taking notes when I read nonfiction occasionally, too - I find it helps me to make connections between ideas when I rewrite them in my own voice.