using sudo

[David Berg <drberg1000 gmail com>]

I'm in the process of switching from ubuntu to Fedora and am so far
impressed.  The first thing I want to change is how administration is
handled.  I like ubuntu's decision to remove the root password and only
allow root access through sudo.

So I gave myself full sudo access, disabled root logins, and eliminated
the root password.  Works great on the command line.

The problem is this:  How can I get the gui's to switch from wanting to
use an su interface (and asking for a non-existant root password) to
using sudo?

Is there setting or link I can change to have everything switch over?

--Dave