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I have domain1 and domain2. I want my visitors to use both to reach my product web site at domain1. Do Google will consider domain2 as duplicate content if I point it to domain1 via CNAME directive in DNS zone?

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What you should do is host domain2 and use an HTTP 301 Redirect to send the browser to domain1. Google recognizes this not only as "not duplicate" but sends all your domain2 "juice" to domain1.

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Yes, this is the option i use for some sites. But, do google consider CNAME as duplcate? – Ross Jul 5 '10 at 12:14
CNAMEs look like different sites, so Google will not consolidate your juice and will penalize one of the sites for duplicating the content on the other. That's why you need the 301 Redirect -- that fixes the situation. – Jason Jul 9 '10 at 1:26

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