It seems Google is beta testing a version of GMail which will allow you to have your domain’s email handled exclusively by GMail. Unfortunately, although I applied, I’ve heard nothing back after applying for the Beta.
This is something that I’ve wanted for a long time but the ability to register your email addresses with GMail and then send using that email address was never up to par, mainly because Microsoft Outlook puts all of that “on behalf of” crap in the “From” line and still shows your gmail address.
I’m hopeful that I’ll either be accepted for the beta or, when it’s released, it’s just as costly as standard GMail.