Alvin Plantinga on ontological arguments

Ontological arguments are widely considered to be among the least persuasive for God's existence. I must confess that, while I remain unconvinced by them, I have never been persuaded that the standard criticisms of them are as strong as people think. I have always had something of a soft spot for them. And Alvin Plantinga's version of the argument is one I have always found worthy of serious consideration. Here it is in a chatty form.