I have a minor connection with a major R&D outfit here in the USA. The outfit has a pro-active in-house computer support operation. It forbids the running of any version of Vista on any computer connected to the organization's in-house network. The support operation intends to examine how software important to the users runs with Vista and then decide whether Vista will be allowed. Also what changes the users will have to make in their computing activities / equipment in order to use Vista.
I wouldn't touch Vista today unless I was a born experimenter and my PC wasn't just an important utility. I'd imagine that others feel the same way and this will have a negative effect on PC sales. Or is there a way to get a new PC with XP instead at no extra cost? I understand the Linux option, but some people don't want to / can't go that way.