Eva-Lotta Lamm has published a book of sketches she crafted while at web conferences over the last two years. The book includes notes for 100+ speakers, including Edward Tufte, Jesse James Garrett, Dave Gray, and Eric Reiss.
I’m always impressed with people that can take talking points or ideas and make them visually interesting. Rather than creating an ordinary bullet list that is less likely to be referenced after the conference, this is a great way of channeling your creative self and bringing ideas to life that you can later share with others (and possibly make a profit on!).
Check out some sample pages on Flickr.