jquery for at least the radius / corners item.
For gradient backgrounds see this.
I came across this by looking for fixes to using 'gradients and border-radius' in IE9. And yes while its true you can now use both in IE9, you sadly cannot use them together.
The issue is documented in a a few places:
The issue seems to be related to border-radius not playing nice with IE's old filter gradients. Sadly the release of IE9 did not bring proper CSS gradients.
Check out http://css3pie.com/, provides a pretty simple solution (htc file) for making this work. As monn indicated IE9 gradient and radius don't work together. Css3Pie is intended to let you dev with css3 markup but provides backups for IE back to IE6.
There's also css3please and compass (for ruby).
This issue has recently been discussed in the HTML5 Boilderplate issue queue (HTML5 Boilerplate is a well-vetted collaboration to bring together the best techniques in modern web markup as a starting point for any platform). https://github.com/paulirish/html5-boilerplate/issues#issue/354
Here's a demo of the problem & solution: http://frugalcoder.us/post/2010/09/15/ie9-corner-plus-gradient-fail.aspx
This is quite new: https://github.com/bfintal/jQuery.IE9Gradius.js
Just include the script last in your head tag and it should handle the rest. See readme notes
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