Some Aspects of the AdS/CFT Correspondence
  This is a very brief review of some aspects of the AdS/CFT correspondence with an emphasis on the role of the topology of the boundary and the meaning of the sum over bulk geometries. To appear in the proceedings of the 73rd Meeting between Physicists and Mathematicians ``(A)dS/CFT correspondence,'' Strasbourg, September 11-13, 2003. 
Jan de Boer, Liat Maoz and Asad Naqvi