Er, you mean to say "compiles to machine code." There is no such thing as concurrent machine code... Now the Go language has some fantastic data structures baked-into the syntax that provide a language with which to construct concurrent programs.

Go has some potential (I'm still waiting for Gen/censored/ics :)). Also, I'm particularly interested in components based web frameworks, and there seems to be none so far - last time I found GWT like library for Go, but it is undeveloped/dead I think.