Government unfortunately - they are still very slow moving. And those that have moved have just moved to IE7..which doesn't help that much.

And banks. I work with several banks and they are all on IE7. IE9 should be rolling out in another couple of years, maybe.

True. I worked for a few banks and used Flex in one project. I cannot say that I loved the tech, but I saw many people struggling to make html/js/css applications work with IE and it was a relief to not have to worry about it.