By the time you finish and have it running smoothly, IE9 will be closer to completion (if not already released). Then you already have support for IE. So unles

By the time you finish and have it running smoothly, IE9 will be closer to completion (if not already released). Then you already have support for IE. So unless there's a burning desire to market this to IE users right this minute, save yourself the hassle and let IE catch up with standards while you work on a better javascript client with Canvas.