I just started to learn new language, that's Google Go. Language is pretty new and there are a lot of stuff that could be changed there.
http://groups.google.com/group/golang-nuts
Just go to the lesson directory and go run *.go. Some of lessons require running tests. Do go test there.
Hello world! - thats basic start point for programming language learning.
Functions - samples for functions usage in go. Functions are basic programming units in that laguage so its very important to understand how them works.
Packages - functions in Go could be united in to packages. That is so called modular programming paradigm.
Arrays
Slices
Maps
Structs