Hundreds of thousands of consumers collectively save millions of dollars each month by replacing (or supplementing) their traditional telephone service with personal voice over IP (VoIP) telephony.

By maintaining your list as a database, you can segment in many ways for targeting. Targeting improves the productivity of your offers. You can use a database to isolate the segment of your list most likely to respond to a particular offer. With a good database, you're not "mass-mailing" your offer to parts of your list that may have no interest in it (based on their characteristics). Because the number you're mailing is smaller, your response rate (number responding/number mailed) - one measure of productivity - should be higher. (And, of course, you'll save on printing and postage costs.)