So there\'s no shortage of information out there on rounded corners and I\'ve been through much of it and I\'m posting to get the opinions of the communities on this point.
I've had some experience with the Javascript methods described above and they all work great. Personally I would go for something that integrates well with existing Javascript frameworks, like JQuery (which would be my personal choice).
Applying the effect to a lot of elements can be very cumbersome for the browser in terms of memory usage however. I've had quite a lot of browser crashes due to me being too generous with applying corner effects.