At Jahia, we constantly run into the problem of IE 6 support, which (unfortunately) is still a requirement for us. But I couldn't suppress a huge smile when the following excerpt from this page : 
SharePoint Server 2010 won’t support Internet Explorer 6<. From the SharePoint Team blog: SharePoint 2010 will be “targeting standards based browsers (XHTML 1.0 compliant) including Internet Explorer 7, Internet Explorer 8 and Firefox 3.x. running on Windows Operating Systems. In addition we’re planning on an increased level of compatibility with Firefox 3.x and Safari 3.x on non-Windows Operating Systems,” according to the SharePoint Team Blog."
So basically even Microsoft is not phasing out IE 6 support and improving compatibility with Safari ! I love the "targeting standards based browsers", clearly implying that IE 6 is far from it, which I think nobody in their right mind will contest.
The real problem is that according to a Forrester Research report, IE 6 still has a 60% market share in the enterprise. I believe that the only real way that we can get this situation to change is for companies to introduce a browser policy, and to possibly use Firefox as the "new browser", and whatever version of IE is required for "legacy applications". But the reality is that IE 6 must die, and if the newer versions of IE are not interesting enough, then users should switch to other implementations, like Firefox, Safari or Chrome.
Another interesting point, although less surprising, is that CMIS is confirmed for the next version of SharePoint.