Go's not-in-core packages are a mixed bag. Lots of "one off" experiment projects. Which is fine, thats where it is in its life. Node.js was in the same place packages wise 18 months ago.

Additionally, at the time we were looking at this, Go was still doing releases every 2 weeks -- this was months before the Go 1.0 plan was even announced: http://blog.golang.org/2011/10/preview-of-go-version-1.html