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I feel your pain, where I work we still have to build for IE6 :S
I've just checked, and 16.63% of our visitors in the last week used IE6. F**k me, at least no one is using 5.5 :dead:
It'll be companies that are out of date, we are still on IE6 at work until we upgrade to Windows 7 next year, maybe the year after for some mobile users like me
OP - Don't forget safari