Having once spent a happy afternoon browsing the Guile info pages, but otherwise pretty unfamiliar with it, this seems to realize a lot of the promise that Guile has had from the beginning. Specifically, the idea that the language that ties together the GNU operating system is not C or bash, but Guile Scheme. A language that can do very low level stuff and GUI development and be used for scripting, empowering the users of a capital-F Free operating system that's hackable all the way down. That's my impression anyway. As I said, this is mostly gleaned from the Guile info pages, but I was impressed by the consistency of that vision with the GNU project's overall goals.