My pet peeve du jour? Commenting systems on blogs that require you to fill out both an email address and a website (rather than one or the other, or even neither), but don’t tell you that both are required until you try to post. First of all, I usually put my blog site on my comments and not my email address, in case the commenting system publishes the email address. Although Yahoo hosts my email and has great spam filtering, I don’t need any extra crap in my inbox. Secondly, what sort of sucky user interface is that? Didn’t the person who designed that ever look at the conventions for indicating required and optional fields?