At today's 3D2, we unanimously agreed that it is time to drop official support for IE 5.5. The cost of extra code and testing required to support IE 5.5, a browser no longer supported by Microsoft nor distributed as any part of currently shipping versions of Windows, is no longer considered to be a worthwhile investment of our limited resources. We'll be putting together an official IE 5.5 deprecation plan, and put it to a vote this week.