Why not Flex?
mikeryan: Well first, you're writing a chat app.In this case Flex might be the right solution for you. Heavy back and forth, it dosn't really need to be indexed by browsers.You likely want some sort of combo with Flex and HTML.The border issue is kind of a non-starter and not really relevant for a broader discussion (BTW I just use the new CSS rules and let new browsers have rounded edges and the rest get squared - easy enough)