I turned off UAC within a week. It is severely annoying.
I hear ya there.
At work, I've got a few users who have Vista. Company policy is that UAC must be turned on. So after a week of Vista, what are they doing? They've learned to "click-through" the UAC prompts so quickly that they don't even see what they say -- they just approve without thinking about it.
It's a perfectly natural reaction. But it's a disaster, security-wise.
Good Hunting... from Varmint Al