I have my first@last.com just forward to my gmail address and hen set up gmail to send as the other account. That way, I keep my vanity and my sanity.
first@last.us (sent by first.last@gmail.com)
Clearly not desirable, and in my case, unacceptable. I actually switched from the GMail webapp to multiple accounts in Mail.app for this reason alone. I miss the webapp, though.http://mail.google.com/support/bin/answer.py?hl=en&ctx=m...
(Click "I'm a Gmail or Google Apps user sending from an external address", then search for "on behalf of".)