So it looks like if you have a pre-Gmail Adsense account you can't change the contact email on that account over to your Gmail account. This seems ridiculous, but that is the roadblock I am at right now. Here is what the Login Change pages says:

!Note: We're not able to update logins to Gmail or Google Account addresses at this time. We sincerely apologize for any inconvenience. 

So what are us Gmail users supposed to do? Set up a hotmail account in order to access out Adsense pages if we need to change email addresses? Or set up a new Adsense with the existing Gmail account? If anyone has a good solution for this- or if I am just confused- I'd love to hear back.