  We further investigate relationships between activity cycle periods in cool
stars and rotation to include new cycle data, and explore different
parameterizations of the problem. We find that relations between cycle and
rotational frequencies (omega_cyc vs. Omega) and between their ratio and the
inverse Rossby number (omega_cyc/Omega vs. Ro^{-1}) show many similarities,
including three branches and similar rms scatter. We briefly discuss some
implications for dynamo models.
