Ask HN: What do you use to take notes?

I second this. For me, anything with tagging and search would work. Mine lives in Dropbox (it runs in Firefox) so it's backed up and available on all my machines. A lot of the notes and ideas in it start out on paper (e.g. written on the go, or whenever the idea strikes me) so I get the benefits of paper. But rediscovery becomes essential as the volume of notes get large. Paper is ineffective because of the lack of search capability.

My first reaction was "how do you write with Vim on paper?"