Just as a followup: because the TD is hosted within IE, there is very little that the TD can do that cannot be done on a web site (some, but not much), so any problems that one sees with IE within the TD will also be a problem on a website that happens to use the same IE feature. Thus, Microsoft has every incentive to fix these issues. There were similar issues with IE7 and IE8 and the TD, if I recall correctly, all the way up to the RC versions. When the final version was released, the issues were resolved and the TD continued to work just fine. I'm crossing my fingers this will be the case with IE9.