Based on this snippet. More clean, with links to the related admin forms.
Nice example on customization of contributed django admin apps.
It adds the following to the user list interface: fields for is_superuser and is_staff, last login time; by default, short names of groups user is in (mousehover to see full names) It adds the following to the to group list interface: list of users in your groups.
To enable, just put it somewhere and import it from your main urls.py: import utils/admin_auth.py