The Bactra Review   Statistical Thermodynamics of Nonequilibrium Processes
See the excellent recent review article by David Ruelle, ``Smooth Dynamics and New Theoretical Ideas in Nonequilibrium Statistical Mechanics,'' Journal of Statistical Physics 95 (1999): 393--468, also chao-dyn/9812032. For the linear regime, Dieter Forster, Hydrodynamic Fluctuations, Broken Symmetry, and Correlation Functions (Reading, Massachusetts: Benjamin Cummings, 1975) is still invaluable, and has even been reprinted (Addison-Wesley, 1994) --- with the original miserable typography.