FuckedCompany.com (http://www.fuckedcompany.com/index.html), though it isn't posting new companies anymore. The author wrote a book called "F'd Companies" that chronicled some of the worst dot-bomb era flameouts.
CNET's list is classic (if that's what you're looking for). It includes such classic one-hit wonders as: Boo.com, Webvan, and Pets.com. It's a good list to learn that spending lots of money quickly on marketing will not make a great idea better.