Exotic Quarkonium Spectroscopy: X(3872), Z_b(10610), and Z_b(10650) in   Non-Relativistic Effective Theory
  This talk summarizes recent developments in quarkonium spectroscopy. I comment on the relation between the Z_b(10610) and Z_b(10650) and recently observed Z_c(3900) and Z_c(4025) states. Then I discuss a number of calculations using non-relativistic effective field theory for the X(3872), Z_b(10610), and Z_b(10650), under the assumption that these are shallow molecular bound states of charm or bottom mesons. 
Thomas Mehen (Duke U.)
hep-ph