The Glade 4.0

Is the domain drop down box/choice a group policy setting? I have a machine (with a particular user) that keeps reverting to local machine instead of staying on the correct domain choice.

on XP its the last domain logged into unless its specifically set to log into a default domain--

A. To set the default domain each time you log on, perform the following steps:

Start a registry editor (e.g., regedit.exe).
Navigate to the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon subkey.
Double-click DefaultDomainName (or create this value of type String if it doesn't exist), and set the value to the preferred domain.
Double-click AltDefaultDomainName (or create this value of type String if it doesn't exist), and set the value to the preferred domain.
Close the registry editor.

Also, here's an article on hacking your own GPO setting that will do this for you domain-wide if you ever have need for such a thing:

http://windowsitpro.com/article/articleid/47055/how-can-i-use-a-group-policy-object-gpo-to-set-the-default-logon-domain.html

That's odd, though. Like TheRiov said, standard behavior is for the login domain to be "sticky".

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I THINK default Vista login is to log into the domain the PC is a member of. (ie if you you have 7 trusted domains, and 1 domain the pc is a member of, then the pc should default to logging into the domain its a member of, rather than local login or any of the trusted domains. Not 100% sure on that though.)