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ACKNOWLEDGEMENTS

I would like to sincerely thank H. Tanaka from SPring-8 for proposing me as the organizer of IWBS2004. Thanks are given to PSI for covering the workshop fees of all participants as well as the costs of the excursion to the SLS. I am grateful to ``Instrumentation Technologies'' for having been a generous sponsor. Furthermore, I would like to acknowledge the excellent work of my workshop secretary M. Bugmann and the ``technical support team'' consisting of M. Heiniger, B. Keil and T. Schilcher. Finally, I would like to express my appreciation for the excellent contributions of all participants (apologies to the colleagues missing in Fig. 1) which made IWBS2004 a success.

**Figure:** **IWBS2004** participants on December 8, 2004.
$\includegraphics [width=1.0\linewidth]{IWBS2004_participants.eps}$

A strong wish has been expressed to have IWBS2006 hosted by ALS at LBNL in close collaboration with LCLS at SLAC. Therefore IWBS2006 naturally will put a stronger focus on linac based 4th generation light sources.

Michael Boege
2005-01-25