There are two ways to obtain a copy of Git-Blog. The recommended way is to clone the existing GitHub repo and branch a copy for you to work on locally. However, it is also possible to obtain a copy by getting a tar archive of the most recent stable branch and initialize your own git repo within the unarchvied directory.
To obtain from GitHub you can just clone the repository found at <http:://github.com/dwueppel/git-blog/>.
You can also download the most recent archive. Or view the archives section for a list of previous versions.