United Nations Durban Review Conference (Durban II) Funding Prohibition Act of 2008 - States that: (1) no funds may be made available to support the 2009 United Nations Durban Review Conference (Durban II Conference) or any other activity relating to the planning, preparation, or implementation of a follow-up meeting to the 2001 United Nations World Conference Against Racism, Racial Discrimination, Xenophobia and Related Intolerance (Durban I Conference); and (2) the United States shall withhold from its assessed contributions to the U.N. regular budget the proportional amount allocated for the Durban II Conference and any other activity relating to the planning, preparation, or implementation of a follow-up meeting to the Durban I Conference.