many of them I use as randomly selected signature quotes for my email program. that way, I get reminded of them periodically AND I get to share them with others.
I do check that the randomly selected quotation isn't inappropriate for a given email.

those quotes that aren't suitable for this purpose get filed in a Reference file-which I keep on my computer in a program called StickyBrain, a nice place to collect snippets of information.

Ben K.