I find it really useful to write and draw while talking with someone, composing conversation summaries on
pieces of paper or pages of notepads. I often use plenty of color
annotation to highlight salient points. At the end of the conversation,
I digitally photograph the piece of paper so that I capture the entire
flow of the conversation and the thoughts that emerged. The person I’ve
conversed with usually gets to keep the original piece of paper, and
the digital photograph is uploaded to my computer for keyword tagging
and archiving. This way I can call up all the images, sketches, ideas,
references, and action items from a brief note that I took during a
five-minute meeting at a coffee shop years ago–at a touch, on my
laptop. With 10-megapixel cameras costing just over $100, you can
easily capture a dozen full pages in a single shot, in just a second.
I prefer to simply remember what was said. Here is much more, on "How to Think," via Kottke.