There are quite a few examples in the scripts about how to run against multiple databases. Here's what you need to find the tables the public group has no permissions for (SELECT, INSERT, UPDATE, or DELETE).
SELECT so.name
FROM sysobjects so
LEFT JOIN
( SELECT id
FROM sysprotects
WHERE uid = USER_ID('public')
) sp
ON so.id = sp.id
WHERE sp.id IS NULL
AND XTYPE = 'U'
K. Brian Kelley
@kbriankelley