Vincent Flanders' Web Pages That Suck:Source for learning good design by looking at bad design.
Ambit's Totally Useless: A growing list of dozens of Web sites with absolutely no purpose.
Golden Trash Awards: For sites that lack originality, creativity, and purpose.
Happy & Crappy Review the Web: Humorous reviews of many strange web sites by two odd looking teddy bears.
NuttySites.com: Directory of some of the worst, nuttiest, and downright wackiest sites on the net.
The Chaos Engine: Offers a look at the current quality and condition of the web and the internet as a whole. Covers areas such as spam, privacy, serious breaches of "netiquette", forceful marketing, technology and web design.
Tweef Web: A page attempting in its own small way to catalog the weirdest of the web.
Worst of the Web: Features one site per day, with an archive back to November 1996.