It seems that the Dojo toolkit will continue supporting IE 6 for a long time to come as Dylan Schiemann, CEO of SitePen and co-creator of Dojo tells us: When first released, Internet Explorer 4.5, 5.5, and 6 radically improved the lives of web developers with cutting edge features, but it has been 7 years since IE 6 was released. Today, I estimate that developers collectively spend billions of dollars in salary working around buggy behavior in IE.
Check out the full article at InfoQ