Apple has updated their My Info site to allow more Apple ID editing goodness. It's been a while since I've taken a crack at changing any of this information, but last I remember, it wasn't possible to change the actual email correspondence address of one's Apple ID. The My Info site offers a slim, effective UI for adjusting your contact and shipping info, as well as setting your Apple communication preferences (do you want email/mail/phone calls, etc.). Too bad there isn't a new option called "alert me the next time you're about to rev one of your products 15 days after I buy the old 'n busted model."
Thanks Brandon M