Front cover: On the occasion of the Third and Final SedNet Conference, November 25th and 26th 2004, this issue presents a special SedNet Part (pp. 215–238) as well as selected papers (pp. 239–281). The two preceding SedNet Conferences have likewise been accompanied by JSS: The First SedNet Conference, April 22nd and 23rd 2002 and the Intermediate Conference, September 28th–30th 2003. Cover design: Edwin Grondinger, abc.Mediaservice GmbH, D-86807 Buchloe (e.grondinger@abc-media.de)