I would say develop for IE7 & Firefox, making sure stuff doesn't break (is visible and somehow workable) in IE6 and Safari. That will cover 99.99 of your future

I would say develop for IE7 & Firefox, making sure stuff doesn't break (is visible and somehow workable) in IE6 and Safari. That will cover 99.99 of your future customers. I guess you are in danger of having more headaches in the future with bleeding-edge raw, not well supported things...