After years of dreading having to implement in xhtml/css, a designer’s efforts laced with rounded corners, I recently went and proposed a design of my own requiring them. (Doh!)
Over the last few years a number of tried tested techniques have been established…
I’ve never really been a fan of bitmap corners typically using variants of the long-standing “sliding doors” technique. However if there is a 3d aspect to the design this would probably be the best way.