Though not directly related to the position Posner takes in his most recent blog post, it's ironic to consider the fact that patents are filed not by the inventors themselves, but lawyers who represent them. To me, that begs the question of whether or not "someone of ordinary skill in the art" could actually replicate the invention disclosed in any given patent. In reality, depending on the invention, it doesn't seem likely that the inventor could even replicate her own invention using solely her patent as a guide. This is a result of patents that are too vague, too general, and too far removed from the actual technology they purport to disclose.
In his recent writing, Posner has chosen to make the point that companies use either defunct or trivial technology to halt innovation through patent litigation. Recently, the culprit has been Apple, but Apple is, of course, not alone. In the fight against patent bullying, Posner's conclusions are, for the most part, right on target.