  Recent results on the stationary state Fluctuation Theorems for work and heat
fluctuations of Langevin systems are presented. The relevance of finite time
corrections in understanding experimental and simulation results is explained
in the context of an exactly solvable model, namely a Brownian particle in a
harmonic potential, which is dragged through the surrounding fluid. In this
model, work fluctuations obey the conventional form of the fluctuation theorem
while heat fluctuations satisfy an extended form. The connection with other
work in recent literature is pointed out, and further generalizations are
suggested.
