Software performance guru Martin Thompson (@mjpt777) gave an illuminating talk on event-sourced architectures, and why event-driven, state-machine designs are the way forward for complex, multi-path software systems (“Event Sourced Architectures and what we have forgotten about High-Availability”, [slides: 700KB PDF]).
Jon Allspaw (@allspaw) from Etsy talked about the role that Anomaly Detection, Fault Tolerance and Anticipation play in producing highly scalable software systems (Fault tolerance, anomaly detection, and anticipation patterns, slides [PDF, 5MB]).
As head of technical operations at Etsy, whose web traffic is pretty substantial, Jon focused on resilience in software systems: what it is, and how to achieve it.
Stefan Tilkov (@stilkov) from innoQ gave an excellent talk on the importance of a “system-of-systems approach” to software architecture (Breaking the Monolith, slides [PDF, 1MB]). [Update: the video is now online here: http://www.infoq.com/presentations/Breaking-the-Monolith]
In essence, he argued for a distinction between micro-architecture (the design of the individual [sub]system) and macro architecture (the design of interacting systems).