The world of CSS

Article on how to teach the Internet Explorer round off the corners and allow the shade elements. In general all the recommended reading, even if you scored on IE. It is also a good article about CSS3 gradients .
And for dessert solve border-radius in Safari

See also:

• Rounding the corners without images, and not only
• And one more time about the rounded corners and CSS3
• Once again about the rounded corners