I still think it will be a looong time before XP will be completely dead.
Microsoft only about a year ago(maybe two), stopped supporting Windows 98 completely, really.
The fact of the matter is, corporations usually are a couple OSs behind the latest and greatest because it's not cost effective, and their current programs they are using might not work on the latest OS.
I for one am still using XP to this day. It gets the job done and where I need to go and it runs like it is supposed to. I don't have the money to upgrade to Windows 7 right now, and took Vista off my laptop because it was eating about 30% of the performance of the laptop.
Don't pirate OSs people. A legal copy of your OS is worth it's weight in gold. Know this from first hand experience.