The page is oversized,...
Or is it just the background image?
...browser shortcuts don't work...
No worse then IE AJAX Hax
...and there are strange interface quirks like being able to scroll in a panel that has no scroll bar...
Its like an open canvas to an interface designer.
Finding Flex bugs is like playing Where's Waldo. Not bashing your site, just pointing out that Flex has some major problems.
Most of the problems I know are due to poor browser integration. Which open source should help. Feel free to tare my sh** apart for productive purposes.
Summary:I say flex is better than AJAX if file size and runtime are the same.
xhtml only pawns all though!