I want to test 2 domains on the same keyword. Google Adwords will not let me rotate 2 ads for different domains in the same ad group. Their policy is "One display URL domain per ad group." They suggest I put the second domain in a different ad group. But will they let me display 2 ads at the same time? If the keyword is "diet pills" (example) can I bid & have 2 ads show at the same time for 2 different domains? Ie: show both "Buy from domain1.com" and "buy from domain2.com" ads at the same time?
I thing you can surely do that. Create a different campaign for your second domain and select the same keyword(s)
That's still going to be regarded as double-serving, so no Google doesn't permit multiple ads from the same or an affiliated company or person to appear on the same results page... That also covers 'similar businesses' - if the second domain offers basically the same as the first, then it won't be allowed - http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=14179
He is not asking about using same domain on 2 different adwords accounts, but reverse of it, as far as I got his question.