Thank you for the nice words - we really appreciate it.
For Modern browsers we are using CSS 3 border-radius property to create rounded corners for text inputs and text areas. Unfortunately IE6, IE7 and IE8 do not support that property. We are using table to be rendered in IE around these elements to simulate rounded borders by setting background and border color tot eh cells. We are aware for some limitations of these decorated elements in IE, but unfortunately there isn't much that we can do about it. As you mentioned, it will be necessary to flood the CSS layout with a lot of IE style hacks to make it work partially.
I have also tried different approaches to force IE to change the fieldset height according to the new data laded inside it, but with no success. It is expected, that IE9 will support border-radius property, as other CSS 3 properties also, but we will still have to support older IE versions, and again it will not be a complete solution.
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