  The capability of current and future measurements at low and high energy
$e^+e^-$ colliders to probe for the existence of anomalous, CP conserving,
$\tau \nu W$ dipole moment-type couplings is examined. At present, constraints
on the universality of the tau charged and neutral current interactions as well
as the shape of the $\tau \to \ell$ energy spectrum provide the strongest
bounds on such anomalous couplings. The presence of these dipole moments are
shown to influence, e.g., the extraction of $\alpha_s(m_\tau^2)$ from $\tau$
decays and can lead to apparent violations of CVC expectations.
