Annoying credit card offers

I got the third mailing from Providian this week and I decided to call to see if they would take my name off their list. I found the address to write to opt out and I decided to send in a letter to ask them to leave me alone. I opened up the next credit card offer from Citibank and they had a phone number to get your name off of all the credit bureaus' lists.

http://www.optoutprescreen.com

Now, apparently, this doesn't take you off the creditor's list, so you still have to contact them individually to get your name off their list. But by adding your name to the opt out list, no new creditors can get your name.