Nielsen is at it again. This time his target is weblogs, yippee.
Summary: Weblogs are often too internally focused and ignore key usability issues, making it hard for new readers to understand the site and trust the author.
Go check it out yourself at the UseIt website
And Jacob, if your listening, what is taking you so long writing the successor to Designing Web Usability : The Practice of Simplicity (see Amazon for the book and reviews).