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The first trick is to make sure that people will only be on the mailing list if they want to be. This means that the opt in form should be very clear and easy to understand. If check boxes are used to let someone be added to the list, have the check box be large and easy to read. It should also clearly state that checking the box adds them to the list.
Clipping is a handy way to collect important slides you want to go back to later.