Do we have the permission to have his here?
I think, yes, because it's a Google Code-In task (http://www.google-melange.com/gci/task/view/google/gci2011/7127225). If you need, I can contact the author.
Even if it was a Code-In task, it's still his blog. I do not know about the specifics of the contracts the applicants have to sign, but I think it's better to have the author's permission.