  We consider inhomogeneous viscous fluids in flat Friedmann-Robertson-Walker
universe. We analyze different kinds of such fluids and investigate the
possibility to reproduce the current cosmic acceleration providing a different
future evolution with respect to the Cosmological Constant case. In particular,
we study the presence of finite-future time singularities. We also discuss a
general class of "integrable" viscous fluid models whose bulk viscosities obey
to a common differential equation.
