Ja jednak polecam wrócić do źródła wiedzy na temat Google'a czyli do Terms of Use: http://code.google.com/intl/pl-PL/apis/maps/terms.html
Ogólnie kilka ważnych punktów:
Restrictions In using Google Brand Features, you will not:
(i) display a Google Brand Feature in any manner that implies a relationship or affiliation with, sponsorship, or endorsement by Google, other than your use of the Service, or that can be reasonably interpreted to suggest editorial content has been authored by, or represents the views or opinions of Google or Google personnel;
(ii) use Google Brand Features to disparage Google, its products, or the Google Services;
(iii) display a Google Brand Feature in your Maps API Implementation or on your site if your Maps API Implementation or site contains or displays adult content or promotes illegal activities, gambling, or the sale of tobacco or alcohol to persons under twenty-one (21) years of age;
(iv) have the Google logo as the largest logo in your Maps API Implementation or on your website (except as displayed in the map image itself);
(v) display a Google Brand Feature as the most prominent element in your Maps API Implementation on any page of your website;
(vi) display a Google Brand Feature in a manner that is misleading, defamatory, infringing, libelous, disparaging, obscene or otherwise objectionable to Google;
(vii) display a Google Brand Feature in your Maps API Implementation or on a site that violates any law or regulation; or
(viii) remove, distort or alter any element of a Google Brand Feature (this includes squeezing, stretching, inverting, discoloring, etc.).
Dodatkowo jest jeszcze kilka punktów co do użycia komercyjnego, ale nie będę zaśmiecał. Wystarczy Ctrl+F i "Commercial".
Jeśli robisz stronę dla siebie lub tym bardziej dla kogoś - radze przestudiować całość.