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

Answer 1

There are a few workarounds for cross browser rounded corners not using Javascript:

CSS Rounded Corners In All Browsers
An Experiment in Rounded Corners
Rounded corners in CSS (cross browser implementations)

Using CSS3 for webkit & gecko based browsers, SVG for Opera and VML for IE.
Also you may want to use the well-known jQuery Corners if you want it via Javascript.