  Novel theories appear on the world-volume of branes by orienting B fields
along various directions of the branes. We review some of the earlier
developments and explore many new examples of these theories. In particular,
among other things, we study the pinning effect of branes near conifold like
singularities and brane-antibrane theories with different fluxes on their
world-volumes. We show that all these theories arise from different limits of
an M-theory configuration with appropriately chosen G-fluxes. This gives us a
way to study them from a unified framework in M-theory.
