Consumerist is a very popular blog where consumers grievances are posted in public view for 100s of 1000s of ppl to read. That includes the PR persons of big companies. So, if you thing you were treated bad or duped by any company, or any other issues with any company, write a letter to Consumerist with all the details. If the editors post it on the site, consider your problem solved.
The site also has tips on how to escalate issues, emails of the executives of the companies, tricks and a lot more. So, check it out. If you'd like to read the success stories, they have them tagged at Success-Stories.