How to populate active directory users in to drop down list items dynamically in Share point 2010 ?

You can use OOTB feature person or group column, however you can try some options available at this link

http://social.msdn.microsoft.com/Forums/en-US/cd4f709d-6884-4413-98fc-0f3850bc770b/populate-drop-down-list-of-sharepoint-users

http://sharepoint.stackexchange.com/questions/49709/list-of-users-in-dropdownlist-at-adding-form

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