Ruled 4-manifolds and isotopies of symplectic surfaces
  We study symplectic surfaces in ruled symplectic 4-manifolds which are disjoint from a given symplectic section. As a consequence we see that, in any symplectic 4-manifold, two homologous symplectic surfaces which are sufficiently C^0 close must be Hamiltonian isotopic. 
R. Hind and A. Ivrii