I've been using Go for a few months on a few different projects. Neither are my "day job".

The first project is a Google Music player app for Chumby devices (and other similar ARMv5/v6 class devices... will probably port to Raspberry Pi if/when I ever get one). The project is pure Go at this point with its own UI toolkit based on an mmaped /dev/fb.

The second project is a web service API for mobile apps plus an associated webserver.

I hope more companies adopt Go, making it a viable language for commercial programming. Using it is the most fun I've had coding in years.