  Supersymmetric theories with significant lepton flavor violation have
$\tilde{e}$ and $\tilde{\mu}$ nearly degenerate. In this case, pair production
of $\tilde{e}^+ \tilde{e}^-$ and $\tilde{\mu}^+ \tilde{\mu}^-$ at LEPII and at
the Next Linear Collider leads to the phenomenon of slepton oscillations, which
is analogous to neutrino oscillations. The reach in $\Delta m^2$ and $\sin^2 2
\theta$ gives a probe of lepton flavor violation which is significantly more
powerful than the current bounds from rare processes, such as $\mu \to
e\gamma$. Polarizable $e^-$ beams and the $e^-e^-$ mode at the NLC are found to
be promising options.
