Migrating google accounts

If you're like me and made your gmail account in middle school and have been using it ever since, you may have a horrible address for doing real work. I've managed to acquire a respectable gmail account and I need to transfer all my data. Googling around found me this link: http://lifehacker.com/5602545/how-to-migrate-your-entire-google-account-to-a-new-one from lifehacker. We'll see how well it works.