Just as an FYI, my use-case is we're actually using Go as a replacement for C for some of our bigger projects - we've found that Go is a great language for working together on (as opposed to C which our team has conflicting viewpoints on).

So far we've developed a few seperate services but we're now looking at combining Go with our existing C based module such that we can use JSON-RPC to communicate with different modules in a phone system... it's kinda cool but all commercial so nothing open to hack on sadly.