Go is a new programming language designed and written from scratch by Robert Griesemer, Rob Pike, and Ken Thompson (Wikipedia). The main web page is at golang.org. There's a wonderful little playground tool there which let's you try out Go right in your browser.
A little informal study group at work has formed to look at Go so I've finally started playing with it a bit myself. Colleague Jeff McNeill started this off with a series of blog posts on Go, which are quite well done.
Here are a couple of outstanding videos which tell you a lot about the language.
Talk by Rob Pike
Andrew builds a URL shortener