IE6 in December was 0.0% of our traffic: https://sc.omniture.com/x/2wq2n ... 1,121 visits.

I remember Joe Clark (the original and best web accessibility character ;) advocating 'it's not my problem'  regarding broken browsers (and using text sizing as an example) at @media conference back in 2007: http://joeclark.org/appearances/atmedia2007/

"If a browser or adaptive technology can or should handle an accessibility issue, I won’t."

Any large institution that is not providing their visually impaired users with appropriate tools (which could just be Firefox!) for web access is more likely to be breaking the law than us not working round a broken browser. I'm not a lawyer. :)