© 2006 Chris Simon, The University of Connecticut. This material is based upon work supported by the National Science Foundation under Grants DEB 98-07113, DEB 98-12779, DEB 99-82039, DEB 00-89946, DEB 04-22386, DEB 06-19012, DEB 05-20622, DEB 05-29679. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Additional funding provided by the New Zealand Marsden Foundation. Last updated 10 July 2006.