Went to a locksmith Friday and had a spare key made. He gave me some info that I didn't find on here. If its already been posted, sorry.
On your original key there is a number.
He said to write it down on the registration and on a piece of paper in your wallet.
He told me that any good locksmith can cut you a key using that number if you happen to lose your key and need one in a emergancy.
I know that most of us carry a hidden key, but I thought this info was good to know. I guess you really do learn something everyday.