Richard Crowley introduces Go standard library's HTTP packages, the relationship between JSON and Go's data structures, and Go's support for reflection, useful to create safe APIs.
Andrew Crump shows how to deploy and scale applications written in a variety of languages (including Clojure and Erlang) to Cloud Foundry.
Petar Maymounkov introduces Go Circuit, a system that reduces the human development and sustenance costs of complex massively-scaled systems nearly to the level of their single-process counterparts.
Rob Pike explains how Google designed Go to address major development issues they encounter while using other languages: long build times, poor dependency management, lack of robustness, etc.
Andrew Gerrand introduces Go, demoing some of its main features through examples: a concurrent echo server, chat, channels, error handling, etc.
Brian Ketelsen introduces Skynet, a platform for polyglot, distributed and composable services that communicate with each other over RPC/JSON.
Bruce Eckel emphasizes using different languages within a project, each one for the task it is better fitted for, and giving several such examples: Python+Scala, Go+Python, Python+CoffeeScript.