Straker's Post-It Notes
Here's a clever little book about using 3M Post-It Notes for information triage, planning, and decision-making in small groups. The core idea is to use wall space as a sort of ad hoc spatial hypertext; Straker offers detailed recipes for brainstorming and planning meetings.
Of course, doing this in Tinderbox with a projector lets you save everything easily. That means you can pick up next week where you left off, and you can send the meeting notes to your management or your London office or your weblog.
Update: comments and further thoughts from Johndan Johnson-Eilola who writes that 'I frequently do use Tinderbox as if it were a big box of Post Its and a whiteboard.'