Now that IE 8 is available:
http://www.microsoft.com/windows/internet-explorer/worldwide-sites.aspx
That's three flavors of IE to manage - 6, 7, 8 and QA code against and if you add in Firefox, Safari, Chrome, etc - 6 browsers.
How are folks dealing with all of these browsers and enabling the most diversity amongst them with their code?
What do you think about Virtual Machines with the base Operating Systems and then clone them and upgrade the browser so we have Windows 2000 Pro with IE 6, 7 and now 8 and then WinXP Pro with IE 6, 7, and 8, etc?