The VLBA 2cm Survey: Kinematics of pc-Scale Structures in Active   Galactic Nuclei
  The kinematics of jets in active galactic nuclei (QSOs, BL Lacs, Radio Galaxies and Empty Field objects) on parsec scales is being studied with Very Long Baseline Array observations at 15 GHz of a sample of more than 170 radio sources. More than 1000 images have been taken since 1994. Here we present an overview of the results of our study, including the proper motions of components in the jets, and their relationship with other source properties. 
E. Ros (Max-Planck-Institut fuer Radioastronomie, Bonn, Germany)