I agree that without a very frank up-front discussion about IE6 limitations, you'll find yourself redoing PNGs as GIFs and writing some conditional CSS hacks the night of launch when the client's sister boots up her Compaq to check out the cool new site.
This post had so much promise. I thought maybe we'd talk about database optimization or PHP modifications. Instead, I wager the OP is using IE7 on a Celeron-based laptop with 2GB of shared RAM, with a Yahoo toolbar and Norton.
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