A few people in this thread (and elsewhere when the topic of IE6 comes up) bring up the problem of applications that are dependent on IE6 as a reason why many business users cannot upgrade.

I'm curious, does anyone have any actual experience with such applications? Do you use them yourself? Do you work for a company that uses them? Did you develop them? Are you aware of any statistics that cite how prevalent these applications are?

I'm beginning to wonder whether these IE6-dependent applications are widespread in reality, or whether they server more as a rhetorical rejoinder anytime someone brings up the idea of forcing people to upgrade.

It certainly feels more and more to me like progress on web applications is being highjacked by an extremely small minority of enterprise IT departments.