The 0.5 release of GG is out. It comes with some bugfixes, and a lot of patchs from steve (mainly : "no need to pass pointers to slices or maps, they are basically reference types anyway" ... thanks a lot : I had forgotten that ... and sure: it removes a lot of &/* in the code). There is no new feature ;-(. But I'm still working on a badly named "gg+" which is able to guess the gg'makefile for a set of files (using ast/token package). In fact, I would like to add this kind of feature in GG (but it will double the number of lines, sure ;-), and it's a little bit more complex than expected.
With this new version, GG comes with its own page on this website, which try to explain its features, and how it works. (but I'm agree : I can do a lot better ;-).