  We compute properties of the interface of the 3-dimensional Ising model for a
wide range of temperatures and for interface extensions up to 64 by 64. The
interface tension sigma is obtained by integrating the surface energy density
over the inverse temperature beta. The surface stiffness coefficient kappa is
determined. We also study universal quantities like xi^2 sigma and xi^2 kappa.
The behavior of the interfacial width on lattices up to 512 times 512 times 27
is also investigated.
