If you don't already read it, pop right on over the The Consumerist! This site is a gem. Yes, it's part of a group of corporately owned sites, blah blah blah. Corporate customer service management reads it. It's taken seriously. And if you are being screwed by a company, check The Consumerist. Someone else may also be in the process of being screwed.
You'll find tips for how to get out of your crappy cell phone contract, tricks to reach a real person on a phone tree, and the private phone and email addresses for corporate head honchos.