Since cancelling my Discover Card, I've been receiving nasty phone calls from people at Discover trying to get me to come back. This latest caller was rude/condescending to my wife, then said he must talk to me. He then tried to convince me to keep my account open but not get a credit card. And he'd give me a 0% interest rate. He says I should keep the Discover Card in case of emergency. I keep telling him no, but he keeps pushing. Grr.
Discover, if you're listening, here's a tip: being rude and nasty to potential customers is a bad business strategy.
Update [2004-08-01]: See this list of bad experiences with cancelling a Discover card.