  Causal viscous hydrodynamic fits to experimental data for pion and kaon
transverse momentum spectra from central Au+Au collisions at \sqrt{s_{NN}}=200
GeV are presented. Starting the hydrodynamic evolution at 1 fm/c and using
small values for the relaxation time, reasonable fits up to moderate ratios
\eta/s\simeq 0.4 can be obtained. It is found that a percentage of roughly 50
\eta/s to 75 \eta/s of the final meson multiplicity is due to viscous entropy
production. Finally, it is shown that with increasing viscosity, the ratio of
HBT radii R_{out}/R_{side} approaches and eventually matches the experimental
data.
