Getting ready for 3GSM next week, and fleshing out more of the people and companies I'd like to meet (yeah, I should've started on this some time ago, but what can I say... the decision to go was fairly last-minute).
So I've been using
MindJet's MindManager on my Mac for a while now, and have found it really helpful for not only sketching out ideas, etc. but also for helping map out networking: Who're the people I want to meet, the people I'd love to reconnect with, the companies I'm interested in, the spaces I'm curious about and the companies and people in them.
Paper's definitely the easiest way to get started with mapping, but tends to break down pretty quickly when you start looking at really large maps, with lots of people/companies in them, and that you want to be able to edit, annotate and share.
So there you go, one other cool way to use mindmapping... I'm just getting into the habit of using this sort of tool, but so far I'm a fan.