I'm not pro windows user, nevertheless it is a good news. Some time I got to deal with Microsoft desktop products and vista is the worst operating system out there. Also, Microsoft may have little choice but to support XP for an extended period since most of its business customers have not upgraded to Windows Vista.
This is the best thing Microsoft could have ever done, IMPO. This will help both IT stuff, admins and users. Also Microsoft don't want to promote Linux here:
Without continued access XP, manufacturers of such systems would be forced to offer them with the rival Linux OS on board -- a situation Microsoft is hoping to preempt.