The previous sample can be found here: 2.0 - Creating a code dir & git repo

The book for this course starts at chapter 1 which covers things like what to expect in the course plus additional resources for learning the basics of Go, but the screencasts start at chapter 2 since the info in the first chapter isn't as useful in video format. All the samples (~2hr of video + 3 chapters from the book) are available at UseGolang.com

The next sample can be found here: 2.2 - Explaining our web application in detail