  We discuss precision tests of the standard model in radiative and
semileptonic rare B-decays and CP-violating asymmetries, and possible
signatures of supersymmetry in these processes. Motivated by current data, and
with an eye on the forthcoming measurements, we restrict ourselves to the
processes in which the bench marks set by the standard model have either been
met by ongoing experiments or are expected to be met shortly. This includes the
mixing-induced CP asymmetry, measured through $\sin 2 \beta$, and branching
ratios for the radiative and semileptonic rare decays $B \to X_s \gamma$, $B
\to K^* \gamma$, $B \to X_s \ell^+ \ell^-$ and $B \to (K,K^*) \ell^+ \ell^-$,
where $\ell^\pm =e^\pm, \mu^\pm$.
