A lot of people have never realized this, but it is possible to set up alerts for other people.
If you have the Manage List permission on a list and library, you can set up alerts that go to others.
This is especially handy if you are setting up a list/library that is using content approval and you don't want to use a workflow.
The process is identical to setting up an alert for yourself, with the exception that you can select other people (you can include yourself, but you don't have to) to be the recipients of the email.
Nothing earthshattering here, but something I've found handy along the way.