CSS3 and the death of Handheld Stylesheets. I hadn’t looked at CSS 3 media queries before (which let you apply different styles based on media features such as screen width, height and colour availability)—they seem like a much smarter solution that handheld stylesheets and also appear to be preferred by device vendors.
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Navjot Pawera from Opera was talking about these queries at the Barcamp Berlin (just before the Web 2.0 Expo)and they indeed looked nice.
They also seem to offer more flexibility.