When you say "Internet Explorer", do you really mean "IE6"? If not, which features does your web app require that IE7/8/9 don't support? I run both Chrome 10

When you say "Internet Explorer", do you really mean "IE6"? If not, which features does your web app require that IE7/8/9 don't support? I run both Chrome 10 and IE8 in parallel on my system, and I can't think of any web apps I've used that don't run on IE8.