  We study aspects of Dirichlet S-branes, which are defined as Dirichlet
boundary condition on a time like embedding of open strings, in general
backgrounds. By applying T-duality along an isometry of the unphysical
dS2-branes in NS-NS supported AdS3-background, we find S0-brane. We also study
the time dependent tachyon condensation on the unstable Dp-brane and interpret
the singular solutions as lower dimensional S(p-1)-brane that couples to real
Ramond-Ramond fields while to imaginary NS-NS modes.
