I've never used Go before, so I went to the project's home page. There's an editing window on the home page with a sample program showing, and a few other programs available in a drop down list. I couldn't help but start playing with the language.

I wonder how much the simple presence of an editing window on a language's home page contributes to overall adoption of the language. It sure lowers the bar to "I'll just write a few lines of code and see how this language feels."