Decomposition of the Diagonal Action of S_n on the Coinvariant Space of   S_n x S_n
  The purpose of this paper is to give an explicit description of the irreducible decomposition of the multigraded S_n-module of coinvariants of S_n x S_n. Many of the results presented can be extended to analogous questions for other finite reflection group. 
Francois Bergeron and Francois Lamontagne