-tjwett, howard
Obligatory Tips on Root:
As iJon mentioned, to activate Root user (Solaris guys call it Superuser), launch NetInfo Manager, and 'Enable Root User', and assign your password. Make it very different than your normal passwords - root is God here!
Make sure in the "Login Options" tab in the 'Accounts' pref in System Preferences is set to "List of Users".
Be sure to disable AutoLogin as well.
Now Log Out.
Root is accessible via the User list now from the 'Other' user. From there enter 'root' as UID and your newly enable password in the PW field.
Feel free to borrow from some of my experience:
Tip 1: Change the background color to something you can immediately recognize as being in root. I set mine to grey. This is helpful in case you get distracted and forget you were in root when you come back. I'd also consider locking the screen saver. This makes you careful.
Tip 2: Root is great for system maintenance like 'Repair Permissions', and backing up or cloning via Carbon Copy Cloner.
Tip 3: Watch your a**!!! Remember, root is God here. The system will not second guess you or even stop you from doing anything. If you Trash your system, it will happily go about deleting the system files, until it chokes on itself. So be very deliberate when deleting things. Even review your Trash contents before emptying it.
Tip 4: Don't install new software - especially drivers while in Root. Some installers can have sloppy install code that the root will, again, happily execute. Wherease if you installed the same in a mere Administrator account would simply "bounce off the walls" without you being the wiser.