The most important insight: unless you are targeting Asia (namely China and Korea,) you can pretty much dump IE6 support as Facebook and Google have done. The

The most important insight: unless you are targeting Asia (namely China and Korea,) you can pretty much dump IE6 support as Facebook and Google have done. The US number is under 3%. I'd like to see a breakdown of that 3%, but I'd guess it's mostly public schools and stodgy companies.