If you haven't heard, there's a serious IE Flaw which is causing lots of people to recommend temporarily switching from IE to Firefox (or Safari, if you're on a Mac).
Our company just went one further. We're stopping the permitted use of IE. With the exception of those sites which require it, or which we control, we are not permitting our users to browse with IE. Between this and the last few issues (mouse pointer vulnerability anyone?), IE isn't good enough to make us risk the loss of corporate data over it.