Windows Vista is Windows ME Part 2. It took five years to develop because three of those were spent building a brand new code base that didn't work at all and wound up getting scrapped, and the remaining two were spent just tweaking the XP code base. Almost all the features we were promised early on were discarded and what we end up with is a warmed over Windows XP that doesn't even do us the dignity of working properly out of the box. I think it's particularly telling that they've already announced the next major Windows release for late 2009.