I'm a huge fan of 37 signals' products and company philosophy. I bet this presentation is going to be the total opposite of most people speaking at the conference - I mean who else is going to get up there and talk about "Planning is vastly overrated" and "Underdoing."
Most presenters are going to focus on all of the amazing features their products offer...however, 37 signals is still more successful than 95% of those other companies.