... I'm wondering what useful applications will be made with this.
Target acquisition for the new micro-UAVs the DOD is developing with armed weaponry. They need test subjects.
I used to get regular email updates on Cassini, but I've moved around and changed email addresses so many times I somehow stopped receiving them.
They have your credit card and a contract that says you promised to pay, and the credit card company will simply pay it and bill you. You won't have a leg to stand on when you complain.
That's why I use Citi-bank disposable credit card numbers whenever possible, so that I can cancel the credit card number I used for the purchase anytime I please (I create a unique credit card number for each merchant), and also limit the amount of money that can be charged to each credit card number to whatever I specify (as well as setting its expiration date to whatever I want).
Real Users know your home telephone number.