the publication date for the book is given as May 2009
http://www.cambridge.org/catalogue/catalogue.asp?isbn=9780521860451
the list of contributors is
C. Rovelli, G ‘t Hooft, R. Sorkin, J. Stachel, N. Savvidou, L. Crane, O. Dreyer, R. Percacci, F. Markopoulou, G. Horowitz, J. Polchinski, T...