I've attended and presented at tons of conferences all over the world. I've also visited quite a number of companies in and around silicon valley. During that time I've been collected the badges from those venues and pinned them to my cube wall. Its become a timeline, but without the organization. In the mess you can make out badges from BlackHat, Defcon, RSA, ISSA, ISACA, eBay, Yahoo, ToorCon, and the private parties in between. Maybe they'll be worth something someday. Which of these do you still have?