  With a sample of approximately 89 million BBbar pairs collected with the
BABAR detector, we perform a search for B meson decays into pairs of charmless
vector mesons (phi, rho, and K*). We measure the branching fractions, determine
the degree of longitudinal polarization, and search for CP violation
asymmetries in the processes B->phiK*+, B->phiK*0, B->rho0K*+, and B->rho0rho+.
We also set an upper limit on the branching fraction for the decay B->rho0rho0.
