go get github.com/davecheney/graphpkg

To graph the dependencies of the net package:

x-www-browser $(graphpkg net)

graphpkg can also filter out packages that do not match the supplied regex, this may improve the readability of some graphs by excluding the std library:

x-www-browser $(graphpkg -match 'launchpad.net' launchpad.net/goamz/s3)