I second the call to stop supporting IE6. While it may still have non-negligible market share, this is probably pure inertia. I highly doubt such a browser has a loyal fanbase that loves IE6 and won't change even if you make it easy for them to get something better, such as by offering a download link to IE7 or Firefox. An equal marketshare of dedicated fans, though, would be worth supporting to avoid alienating them and their browser choices.
