  In this paper we study the evolution of the equation of state of viscous dark
energy in the scope of Bianchi type III space-time. We consider the case when
the dark energy is minimally coupled to the perfect fluid as well as direct
interaction with it. The viscosity and the interaction between the two fluids
are parameterized by constants $\zeta_{0}$ and $\sigma$ respectively. We have
made a detailed investigation on the cosmological implications of this
parametrization. To differentiate between different dark energy models, we have
performed a geometrical diagnostic by using the statefinder pair $\{s, r\}$.
