No books?
Go in Action; Evan Shaw; Manning; http://www.manning.com/shaw/
An Introduction to Programming in Go; Caleb Doxsey; http://www.golang-book.com
Network Programming with Go; Jan Newmarch; Free e-book; http://jan.newmarch.name/golang/
Programming in Go: Creating Applications for the 21st Century; Mark Summerfield; Addison-Wesley Professional; http://qtrac.eu/gobook.html
The Way To Go: A Thorough Introduction To The Go Programming Language; Ivo Balbaert; iUniverse
The Go Programming Language Phrasebook; David Chisnall; Addison-Wesley Professional
The Go Programming Language (upcoming); Brian Ketelsen; The Pragmatic Bookshelf; http://pragprog.com/book/bkgo/the-go-programming-language
Learning Go; Miek Gieben; Free e-book; http://www.miek.nl/projects/learninggo/index.html
Systemprogrammierung in Google Go: Grundlagen, Skalierbarkeit, Performanz, Sicherheit; Frank Müller; Dpunkt Verlag; http://dpunkt.de/buecher/3449.html
Programmierung in Google Go: Einstieg, Beispiele und professionelle Anwendung; Rainer Feike, Steffen Blass; Addison-Wesley