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literally, carta de presentación is business card.

HTH

Rick

J.

this wouldn't work as a slogan (are you loking for one?), but I think that this is the idea behind the sentence.

The best kind of advertisement is word of mouth. Even though it doesn't travel fast, it can do some magnificent results. When one of your past customers tells other people how great your service is, it makes people feel secure, and safe. It gives them a reason why to buy your service or product. Give your past customers a chance to brag about you, use their testimonies. You can use them as powerful tools to increase your sales dramatically.



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Note added at 2002-08-08 15:44:22 (GMT)
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How can you build more word of mouth advertising?

Rephrasing the question, why would your customers want to talk to their friends about their experience of doing business with you? What things can you do that will compel them to do so?

http://www.profitadvisors.com/word.shtml

Word-of-mouth advertising. Word-of-mouth advertising has existed as long as mankind has communicated and traded goods and services. Word-of-mouth advertising is considered the most effective form. Word-of-mouth has the desired qualities of strong credibility, high audience attention levels, and friendly audience reception. It features open-ended conversation with questions and answers about the product, psychological incentives to purchase, memorability, efficiency and frequency. Word-of-mouth advertising passes product information to many other potential buyers (and may even include promotional trial demonstrations and free sampling), at little or no cost to the business. Whenever possible, a small business should build an advertising program that results in word-of-mouth advertising! Satisfied customers are your best advertisements.

http://www.toolkit.cch.com/text/P03_7020.asp

There are thousands more hits for this in Google

standard marketing saying