Superconducting states with extended-s-wave symmetry have been suggest
ed in connection with recent angle-resolved photoemission experiments
on Bi2Sr2CaCu2O8. In the presence of impurities, thermodynamic propert
ies of such states reflect a residual density of states N(0) for a ran
ge of concentrations. While properties reflecting N(omega) alone will
be similar to those of d-wave states, transport measurements may be sh
own to distinguish qualitatively between the two. In contrast to the d
-wave case with unitarity limit scattering, limiting low-temperature r
esidual conductivities in the s-wave state are large and scale inverse
ly with impurity concentration.