css support?
All they did is to put a single MFC programmer onto IE to design a new UI (and sorry, for those great features you'll need two weeks max).
On the other side: what is about properly supporting PNG, CSS, XHTML and a lot of other technologies? IE either lacks it or does it wrong.
Because of that we are still fighting with stone-age GIFs, there are hundreds of extra workarounds for CSS&IE and so on.
Actually a wonder that zengarden manages to create designs which look, feel and work the same way on all browsers.