Mail merge in Pages is really handy for sending individually named letters to more than one person. Guest author Jenine Abarbanel explains how to make it work.
Numbers.app is a superb way to keep a database of names and addresses, a membership list, or any other data which is clearly structured. This Tip explains the first steps in setting up and working with an address database.
iCal and Address Book offer a way to back up their data.
How to back up your Mac’s Address Book.