Some people have been wondering how to use your Gmail account to sign up with using MSN messenger. I finally have the URL again.
Go to (dead link by now) and under “Sign up today”, look out for the second header “Use an e-mail address you already have” and click the “Get started now” link below.
It will later bring you to a registration page where you need to key in a new password. This password is the login password for this MSN account and not the password for your email account. However, you may choose to key in the same password anyway.
Next, MSN will send an email to your Gmail account for you to verify your ownership of that email account. Click the link provided in that email and you will be done with the registration.
This works for any other email addresses from Yahoo and other providers.