I like this! And it's true, we don't have any style guidelines, etc. and I agree that it's needed for group development to be effective. Admittedly, I broke from the coding style that Martino used because it was hard for me to adapt, but I'm thinking that this would be a good thing to do.
In addition to style guidelines, there should be some documentation on other coding standards, like collections, etc. I'll surely have to make a good number of changes myself, but it's good to be reading from the same page.