Well, if you want a promising technology everyone's hyped about the future of js, js is becoming everything and so there you'd have node to play a role. Persona

Well, if you want a promising technology everyone's hyped about the future of js, js is becoming everything and so there you'd have node to play a role. Personally though, I just haven't found node to be that useful compared to Go, also for me the nested callbacks within callbacks are annoying. So I'd say to pick Go, although its a little early in the game to see how well it will be adopted and how many useful libs will be created for it, nonetheless the language itself is beautiful mix that gives you low level (c-like) control and speed, with nice abstractions that make your job less tedious than c and more like python/ruby programming. Last a note about Ruby, I think the VM is amazing the API is great and programming in ruby you can throw things together blazingly fast and clean, so its also a good choice. Overall though I'd say Go, I think its the best language to come around in a long time and people will adopt it