  A preliminary analysis of exclusive $\btou$ decays to the final states
$\pi^\pm\ell\nu$, $\pi^0\ell\nu$, $\rho^\pm\ell\nu$, $\rho^0\ell\nu$\ and
$\omega\ell\nu$ based on $2.2\e{6}$ $\bbar$ decays collected at CLEO is
presented. We have measured the first exclusive $\btou$ branching fraction
$\bbpi=[1.19\pm0.41\pm0.21\pm0.19]\e{-4}$
($[1.70\pm0.51\pm0.31\pm0.27]\e{-4}$), with the ISGW (WSB) model used for
efficiency determination. A 90\% C.L. upper limit on $\bbrho$ similar to the
previous CLEO limit is obtained. The ratio $\gamrho/\gampi<3.4$ at the 90\%
confidence level for both the ISGW and WSB models. This ratio provides some
discrimination between form factor models.
