Vista - new accounts will not be administrators!
I say "yay" to this post from David Cross:
"We have subsequently made the decision that in [Windows Vista] Beta 2, secondary user accounts will be standard users by default."
As he says, it kind of gives the wrong message when you're asked to enter the names of a half-dozen people to be created in your system, and they all get to be administrators of the system. I installed Windows XP SP2 recently on my new laptop, and was more than a little dismayed that I couldn't actually install it without entering a name of a user who then became an instant administrator.
Quite frankly, I'd be happy if installing my OS, I get one account created, called "Administrator", with a blank or hard-to-guess password (blank for home, where physical access is an appropriate security limiter; hard-to-guess for work, where anyone and everyone can walk in).
My next step after installation is usually to join my domain - and I don't want any local (non-domain) users beyond the administrator. I only have to go through and delete their profiles ... which you do through the User Profile tool, not by "RD /S /Q \Documents and settings\username".
[Yes, I could join the domain as part of my installation, but I prefer to leave network cables unplugged until after installation is complete - these days, that's an unnecessary superstition, but it used to be that the firewall wasn't configured on by default.]