These are auto-generated Go libraries from the Google Discovery Service's JSON description files of the available "new style" Google APIs.
Announcement email: http://groups.google.com/group/golang-nuts/browse_thread/thread/6c7281450be9a21e
Getting started documentation:
https://github.com/google/google-api-go-client/blob/master/GettingStarted.md
In summary:
$ go get google.golang.org/api/storage/v1
$ go get google.golang.org/api/tasks/v1
$ go get google.golang.org/api/moderator/v1
... etc ...
For docs, see e.g.:
https://godoc.org/google.golang.org/api/storage/v1
The package of a given import is the second-to-last component, before the version number.
For examples, see:
https://github.com/google/google-api-go-client/tree/master/examples
For support, use the golang-nuts@ mailing list: