Cross browser rounded corners (no image)

Question

When converting PSD's into HTML or even HTML5 and CSS, how much more difficult is it to round the corners and make those corners consistent across all browsers, especially Internet Explorer?

Assuming the corners were rounded with code, not images.

Answer 1

You can check out Corner if you want a JavaScript solution. It's cross platform.

Answer 2

You already accepted but CSS3 PIE you can just use the border-radius property (along with gradients, shadows, and other fun CSS3 features) in IE3. I think it's one of the cleaner ways to approach the problem.