Acorns

Rounded corners have visual appeal that square ones just don't. There will be support for rounded corners in CSS3, and in the mean time, there are already ways using CSS and JavaScript. But those ways have short-comings.

This incarnation of rounded corners uses an image server to generate images. They're generated on-demand and served as static content from then on. This means you get anti-aliased, large-radius, cross-browser corners. Just apply some simple behaviors to your page.