I have a few things I've made in the past that have the border-radius attribute like this:
border-radius: 7px;
This is not working in IE9. I thought IE9 was supposed to support border-radius? If you need an example, see this site. All of the boxes on the right hand side of the page should have a curved border. It works in Chrome and Firefox...
On another annoying, unrelated note, I found out today that IE9 doesn't support the :last-child pseudo class. What an incredible letdown so far...