Using rounded corners with IE today
Web developers often want to add rounded corners to their pages. Since we have no plans to do native rounded corner support in IE7 (CSS3 feature), I want to point out that there is an article available on MSDN that shows you how you can easily and efficiently implement rounded corners with IE today. Enjoy!

这意味着IE7支持圆角表格了。

详细：　http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dhtmltechcol/dndhtml/roundcorners.asp