  We investigate transport in strongly correlated metals. Within dynamical
mean-field theory, we calculate the resistivity, thermopower, optical
conductivity and thermodynamic properties of a hole-doped Mott insulator. Two
well-separated temperature scales are identified: T_FL below which Landau Fermi
liquid behavior applies, and T_MIR above which the resistivity exceeds the
Mott-Ioffe-Regel value and `bad-metal' behavior is found. We show that
quasiparticle excitations remain well-defined above T_FL and dominate transport
throughout the intermediate regime T_FL < T_MIR. The lifetime of these
`resilient quasiparticles' is longer for electron-like excitations, and this
pronounced particle-hole asymmetry has important consequences for the
thermopower. The crossover into the bad-metal regime corresponds to the
disappearance of these excitations, and has clear signatures in optical
spectroscopy.
