I’ve written an article on getting started using git-annex, it’s a static page however, and not a blog post, so you can check it out here:
http://writequit.org/articles/getting-started-with-git-annex.html
Or, if you’d like to check out the original .org file:
http://writequit.org/articles/getting-started-with-git-annex.org
Check it out!