I've been using HTML5 exclusively for several months. Structurally, the code is so much easier to follow. As mentioned before, just drop the shiv in there for IE. CSS3 PIE allows you to use many of the new CSS3 features in IE6+.
A few months back I started diving into HTML5 .. trust me ... its awesome!
Right now I am making a simple game on HTML5 .. but this thing giver so much power to a front end section of a website! Now I guess the dependence on flash will be significantly reduced
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