I wish all privacy policies were written like this one:
The idea behind the service is that you should be able to use disposable information when interacting with different companies:
You send out a one-time e-mail address to Amazon.com when you buy a book. You use a one-time use credit card number that is never used again (attached, perhaps, to a Paypal account). You provide Amazon.com with a dummy home mail address.
Paypal knows who you are, but not what you bought or where you live. Amazon.com knows what you bought, but not who you are or where you live. Fedex knows where you live, but not who you are or what you bought.