* I've already confirmed that there has been no activity on my GMail account since the time I know I last used it, Luckily enough GMail tracks this and I don't access me email any other way.
* Title changed.
* I had a good look at the emails when I first saw them. All the headers look as thought Twitter actually sent them, and all the links in them point back to the real Twitter site. They're not spam/phishes...
* I already got a password reset for the account: the email it was setup with was aarongough@gmail.com, my actual email is aaron.gough@gmail.com (but we already know that GMail ignores periods in email addresses). I logged into the Twitter account after the password reset, tweeted a polite warning that they should not try this whole deal again then deleted the account.
I'm not a rube, I'm a web-developer and have a good understanding of the various points where this could have gone wrong. I'm certain my GMail accoun has not been compromised (I have SSL set to permanently on with GMail, I don't use it on open wifi and my pw is a 10 char randised Alpha/Num/symbol string)
I'm just interested in finding out how they managed to verify the twitter account without access to my email...