I've been listening to the StackOverflow podcasts recently—not as polished as some. Still, I enjoy the content. During episode #12, Jeff complained about the lack of specific criticism. My main point of disagreement is with his need to re-invent the wheel. Specifically, when he said he wanted to rewrite the login functionality for the stackoverflow site. I'm a pretty selective developer and I like to find places where I can refactor code to the point of removing as many lines as possible. But, I just don't see the point of taking tried and true login functionality and saying, no thanks: Especially since it is security code that involves passwords and login information.
Having said all that, I admire Jeff and I avidly read his blog. I just think he should look to reuse and then refactor. Too much is already written that shouldn't be rewritten.