Blott hi
Yes printed and kept the form and number.
I tried that but there are only certain listed amendments you are permitted to make and changes to passport expiry dates is not one of them, I'm afraid.

We shall be visiting a couple of times a year until 2010. THe ESTA would be valid presumably for those periods - it remains to be seen if Immigration will pick up the wrong expiry date?

I assume that when the ESTA expires I will have the opportunity to register again and then 'correct' my mistake then?