I think this move is great for 2 big reasons:<p>1. This fits better with the workflows I know and are common for Go programmers. I use Github and Git regularly for a variety of things, and I only ever use Google Code and Mercurial for things dealing with the Go source or tool repositories. Along with the change of the much of the compiler source code from C to Go, this will make it a lot easier to get involved with the core of Go.<p>2. Simplifies using import paths for Go's tools. There's a bunch of different repositories in Google Code's Go project, and using them is slightly more painful because Go Get then requires mercurial to work. Reducing developer friction is a good thing, especially in odd places such as when a github repository uses a Google code repository and suddenly you need mecurial to import something using git.