  Implications of recent CLEO measurements of hadronic charmless B decays are
discussed. (i) Employing the Bauer-Stech-Wirbel (BSW) model for form factors as
a benchmark, the $B\to\pi^+\pi^-$ data indicate that the form factor
$F_0^{B\pi}(0)$ is smaller than that predicted by the BSW model, whereas the
data of $B\to\omega\pi, K^*\eta$ imply that the form factors $A_0^{B\omega}(0),
A_0^{BK^*}(0)$ are greater than the BSW model's values. (ii) The tree-dominated
modes $B\to\pi^+\pi^-, \rho^0\pi^\pm, \omega\pi^\pm$ imply that the effective
number of colors N_c(LL) for (V-A)(V-A) operators is preferred to be smaller,
while the current limit on $B\to\phi K$ shows that N_c(LR)>3. The data of $B\to
K\eta'$ and $K^*\eta$ clearly indicate that $N_c(LR)\gg N_c(LL)$. (iii) In
order to understand the observed suppression of $\pi^+\pi^-$ and
non-suppression of $K\pi$ modes, both being governed by the form factor
$F_0^{B\pi}$, the unitarity angle $\gamma$ is preferred to be greater than
$90^\circ$. By contrast, the new measurement of $B^\pm\to\rho^0\pi^\pm$ no
longer strongly favors $\cos\gamma<0$. (iv) The observed pattern $K^-\pi^+\sim
\ov K^0\pi^-\sim {2\over 3}K^-\pi^0$ is consistent with the theoretical
expectation: The constructive interference between electroweak and QCD penguin
diagrams in the $K^-\pi^0$ mode explains why ${\cal B}(B^-\to K^-\pi^0)>{1\over
2}{\cal B}(\ov B^0\to K^-\pi^+)$. (v) The observation $\nc(LL)<3<\nc(LR)$ and
our preference for $\nc(LL)\sim 2$ and $\nc(LR)\sim 6$ are justified by a
recent perturbative QCD calculation of hadronic rare B decays in the heavy
quark limit.
