inessential by Brent Simmons

From Woeful to Wow! - 6 Steps to a Stunning Site

WebmasterBase: “Absolutely never let a user (or users) have the power to defame your site. Forms of this include guest books with undeletable entries, and other similar not-so-bright ideas. One of my favorites is the ‘Vote Me off the Net’ polls, where users may rate a site from, say, 1-5.”