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From the experimental branching ratios for $B^- --> \rho^0 l^-\bar\nu_l$ and$D^+ --> {\overl K}^{*0}({\overl K}^0) e^+ \nu_e$ one finds, in the Heavy QuarkLimit of $HQET$, $ |V_{bu}|=(8.1\pm 1.7) x 10^{-3}$, larger but consistent withthe actual quoted range $(2 - 7) x 10^{-3}$. In the same framework one predictsfor $R(B --> K^*\gamma)=( 2 \pm 2 ) 10^{-2}$.Comment: 9 pages, 1 Figure avalaible on request from SANTORELLI@NA.INFN.I

RareB-decays and heavy to light semileptonic transitions in the Isgur and Wise limit