Many times it’s a bad idea that websites, IT-systems are designed by programmers. Most times their implementation model doesn’t match the mental model of an application. The other side is that designers make nice visual things that don’t work neither from usability view nor from implementation view.
A “good” bad-example for that is the new quiz from Esprit. A flash game for winning vouchers or an iPod. You need to register for it. It’s so wonderful to fill out a form with textboxes consisting of grey font-color on grey background. The next highlight is the mixed tab-order you would never expect
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