  The generalized Chaplygin gas, characterized by the equation of state
$p=-\mathcal{A}/\rho^{\alpha}$, has been considered as a model for dark energy
due its dark-energy-like evolution at late times. When dissipative processes
are taken account, within the framework of the standard Eckart theory of
relativistic irreversible thermodynamics, cosmological analytical solutions are
found. Using the truncated causal version of the Israel-Stewart formalism, a
suitable model was constructed which cross the $w=-1$ barrier. The
future-singularities encounter in both approaches are of a new type, not
included in the classification presented by S. Nojiri, S. D. Odintsov and S.
Tsujikawa, Phys. Rev. D71, 063004 (2005).
