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Users are >= 500, not 100, as defined in /etc/login.defs.
This is useful when you enable 'browse' on gdm.
Highest system UID I know is rsbac, 400.
Alejandro, jsaw

diff -Nur gdm-2.14.2-orig/config/gdm.conf.in gdm-2.14.2/config/gdm.conf.in
--- gdm-2.14.2-orig/config/gdm.conf.in	2006-04-07 19:47:20.000000000 +0000
+++ gdm-2.14.2/config/gdm.conf.in	2006-04-17 15:34:27.746879500 +0000
@@ -331,7 +331,7 @@
 # User ID's less than the MinimalUID value will not be included in the face
 # browser or in the gdmselection list for Automatic/Timed login.  They will not
 # be displayed regardless of the settings for Include and Exclude.
-#MinimalUID=100
+MinimalUID=500
 # Users listed in Include will be included in the face browser and in the
 # gdmsetup selection list for Automatic/Timed login.  Users should be separated
 # by commas.