Booth
DEF CON generously donated a booth to EFF, and we had a bunch of volunteers staffing it throughout the weekend. Our booth was amazingly popular: we gave away 50 EFF secret decoder rings in the first hour of the con, and we ran out of essentially everything (t-shirts, stickers, hats, etc.) by the end of the first day. We got dozens of new members and hundreds of donations.
People at DEF CON really seem to like EFF a lot. I also got to talk about a lot of people about current and potential EFF cases, and hot topics in computer security.
I saw a dozen people I knew, or more.