After reading that Google had settled the Gmail trademark dispute in the UK I was wondering why it had changed back. The threads seem to have died out and there is still no confirmation if Google Mail will once again be known as Gmail in the UK.
I got tired of waiting and decided to fix up the logo myself. It's not very elegant but simply involves adding the following to a custom CSS (see customizing Firefox if you need help creating the userChrome.css file in the correct place). Luckily for me Firefox has supported this for ages and even better Chrome recently added support for custom stylesheets.
div.a9 {
background-image:url(http://mail.google.com/mail/images/2/5/highscore/blocky_gmail_logo.png) !important;
}
It may need a bit more specificity as class="a9" is probably used on other sites. I will create a better rule if I stumble on any clashes. When the patch hits the dev channel I hope this will be as easy to get working in Chrome as well.
Edit: The dev channel has been updated and it was just as easy to get working in Chrome - yay!