WordPress is one of the most-used blogging software systems in the world. That's a remarkable achievement in itself, but the loyal cult following Mullenweg and WordPress have cultivated (get it? cult-ivated?), is equally as impressive. It is, after all a CMS system. Important and necessary, yes, but worthy of a rock star status?
In Mullenweg's case, the answer is yes. (It helps, perhaps, that he moved to San Francisco with a quest to be the #1 Google search result for "Matt." He's