Wish I could have made it to this talk, but was too busy coding. However, thanks to the power of the Internets, we can timeshift it to... well, the weekend. ;-)
There's definitely something powerful in the approach. It feels more right than a build-it-and-they-will-come mentality. We're still learning too.
Also, building the tech to track and make decisions like that is almost always custom rolled, which is just a development overhead that ideally could be avoided. Our friends at Mixpanel are working on that -- to help startups apply the same kind of metrics-oriented decision-making done at Slide for startups like yours and mine.