I wonder about a paper-based wiki sometimes, or paper databases. You need stick-out tabs with labels to make it work, and you need to be able to pick out and re-sort things too. Paper doesn't afford the same kind of explosive freedom as purely digital storage, but sometimes there's a tactile deliciousness to thick card and printed labels. Like your own private library catalogue in an obsolete disk box, resorted according to the week's whims - this time alphabetical, this time by tag. Portable and zero-power when idle. It's one of the things that will remain when the internet melts down under the weight of spam.
Mokalus of Borg
PS - But it can't survive a fire as easily.
PPS - Backups of paper are much harder to produce and store off-site.