  We provide a comprehensive test of factorization in the heavy-heavy $B$
decays motivated by the recent experimental data from BELLE and BABAR
collaborations. The penguin effects are not negligible in the B decays with two
pseudoscalar mesons. The direct CP asymmetries are found to be a few percent.
We give estimates on the weak annihilation contributions by analogy to the
observed annihilation-dominated processes. The $N_c$ insensitivity of branching
ratios indicates that the soft final state interactions are not dominant. We
also study the polarizations in $B\to D^*D_{(s)}^*$ decays. The power law shows
that the transverse perpendicular polarization fraction is small. The effects
of the heavy quark symmetry breaking caused by the perturbative QCD and power
corrections on the transverse polarization are also investigated.
