A lengthy (and serious) comparison of Harry Potter and Hamlet, including the dead fathers, denial of the love interest, unwilling avenger, and so on. Some of the points are strained, but it's not like the author just whipped something out. Obviously a good deal of thought was put into the argument. Apparently he's working on a conference presentation on the subject.
(*) Title comes from the fact that Rowling has attempted to sue people who borrow "her" ideas, which in turn caused a great number of authors (Orson Scott Card among them) to point out that, if that's the case, she'd certainly stolen many of theirs.