  We present calculations of cross sections for single $W^-$ and $Z$ production
and $W^-W^-, W^-Z, W^-\gamma, ZZ$, and $W^+W^-$ pair production within the
Standard Model at $e^-e^-$ linear colliders. We evaluate Standard-Model Higgs
boson production in the channels $e^-e^- \to e^-e^- H$, $e^-\nu W^- H$, and
$e^-e^- ZH$. We also illustrate the enhancements in the $W^-W^-$ cross section
that would result from a strongly-interacting Higgs sector or from a $H^{--}$
resonance in a Higgs doublet + triplet model.
