For those admins here that are always downplaying Vista based on the UAC nags or how turning them off entirely is not a healthy choice, there is hope for you yet!
Vista contains a locked, hidden Administrator account that works from the root, and automatically disables UAC prompts, without turning them off for other/normal users.
More here: http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9015738&pageNumber=2