Links added to the tutorial page :
H.A. Priestley : Ordered sets and complete lattices(.pdf, 75p., 2001)
M. Erné, J. Koslowski, A. Melton and G.E. Strecker : A primer on Galois Connections (.ps, 22p.)
R. Backhouse : Galois connections and fixed point calculus (.pdf, 105p., 2001).