Good news for those of us who intend to keep using Windows XP until a viable alternative emerges: Microsoft extends XP downgrade rights date by six months.
But a warning to fellow XPers: Beware XP Service Pack 3. I am now pretty much much convinced that the purpose of SP3 was not to extend the life of XP (why would Redmond want to do that?). The effect, if not the goal, was to mess up a perfectly fine XP install and thereby nudge the user towards Vista.
That conclusion is based on my own experience doing an SP3 install on my test machine, and the oodles of posts I found from people who, like me, ran into problems, and evenetually uninstalled SP3 (after which my machine worked fine). I will not be putting SP3 on my 'main' machines.