Jonah Fox has released a jQuery Plugin that will add those coveted curvy corners to your site with the use of Canvas/VML.
Usage:
$('.myclass').curve(options)
Options include:
* radius
* borderWidth
* background
* borderColor
* corners ("tl br tr bl"). Specify which borders to draw
Example JavaScript
$('h1').cornerz({radius:40, borderWidth: 0, corners: "tl"})Example HTML
<h1 style='margin-top: 0px;'>Cornerz v0.2</h1>
Result

The corners are antialiased and load fast, partially do to the script only being 4K - uncompressed. There is a known issue with IE having trouble with odd height values. Jonah's workaround is to use padding-bottom:1px for elements with odd heights.
* Tested on :
- IE6 XP/Vista
- IE7 XP/Vista
- Firefox 2 Ubuntu/Windows
- Safari 3 Windows
- Opera 9 Windows/Linux
Visit the Cornerz homepage to view some demos or click here to see the source.
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