The script can be used to perform any task against all databases hosted on an instance. This is an example script that checks if a user is in a database if it is not then create the user and add it db_datareader role.
2016-02-02 (first published: 2016-01-15)
DDL trigger will add a user to a newly created database and assign db_owner role. It can be modified for what role is required.
2015-03-12 (first published: 2013-08-22)
Database tables without primary key, clustered index and no index
2008-08-13 (first published: 2008-06-17)