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These are the countries that do allow dual-citizenship:
Sweden, Finland, France, Iceland, Canada, USA, Great Britain, Australia, Albany, Algeria, Antigua and Barbuda, Argentina, Barbados, Botswana, Bulagaria, Colombia, Cyprus, Djibuti, The Dominican Republic, Egypt, Gambia, Greece, Guyana, Iran, Ireland, Israel, Italy, Jamaica, Jordan, Kazakhstan, Croatia, Lithuania, Lichtenstein, Macedonia, Malaysia, Morocco, Mauritius, Republic of Moldova, New Zealand, Nigeria, Panama, Poland, Portugal, Romania, Russia, San Marino, Schwizerland, Singapore, Slovakia, Slovenia, Sudan, South Africa, Taiwan, Tanzania, Trinidad and Tobago, Tunis, Turkmenistan, Hungaria, Uruguay, Vietnam, Republic of Yemen and last but not least Turkey.
Unfortunately my country doesn't allow it so that will certaintly cause me a great deal of anguish in the future.
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Also if you are married with a turk, you must make that again every time your visa expires or you must ask for the Turkish nacionality (and in my case, I can´t have both of them, Turkish and Spanish, so I must renounce to my Spanish one in order to get the Turkish one... 
but maybe I´ll do it, I´m still thinking about it...)