We describe the production, properties and scientific potential of the
XMM-Newton catalogue of serendipitous X-ray sources. The first version of this
catalogue is nearing completion and is planned to be released before the end of
2002.Comment: Proceedings of the "X-ray surveys, in the light of the new
observatories" workshop, Astronomische Nachrichten, in the press (4 pages, 3
eps figures, uses an.cls