Contact Cheryl, Scottw or one of the mods (like me) with the details.
If you are able to still access your .mac emails, change the password to something that uses a different logic. Also if you use the same password (or logic for passwords) for any other site, change them as well. Sometimes the people that might know/guess your password are more closely related to you, e.g. once my ex called me because
I had changed my email password and he couldn't access it...
It might be also worth to check with
http://www.apple.com/support/mobileme/ if anyone other than yourself has accessed it, e.g. from which IP address the forwards were done from.