The present book is comprised of works that are closely related to the content of the seminars and plenary talks given at the 2004 Conference. It includes contributions from Richard M. Aron, Fernando Bombal, Javier Duoandikoetxea, Gilles Godefroy, Nigel J. Kalton, Lawrence Narici, Michael M. Neumann, Baldomero Rubio, Manuel Valdivia, Joan Verdera, and Felipe Z6 (co-authored with Hector H. Cuenya).