Exactly how philosophy should proceed:

The International Kant Interview

It's remarkable how many big names they got to respond. And a given philosopher's answers are sometimes quite revealing, if not of their philosophical views, then at least of their personalities. (For instance, take a gander at Apel's lengthy response to the second question, complete with detailed citations from his own work.)

Still what this webpage needs is a statistical breakdown of the responses. Until I see that, I can't really be sure what Kant's biggest mistake was.