I speak at a lot of events internationally on web design, social interaction design, and design strategy.
Designing for Social Traction
With over 136,000 views on Slideshare, this presentation has taken on a life of its own. It covers the three primary problems of software: Sign-up, Getting Started, and Passionate Use. It is the best overview of my philosophy on designing web applications and is a great primer on the idea of the Usage Lifecycle.
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Metrics Driven Design
I first presented this at UX London in 2010 and it was very well received. I gave a second edition at SXSW 2011 (slides are from this talk). This talk is about how to make design decisions based on metrics that drive your business...an increasingly important area of focus for companies.