The papers in this volume were presented at the workshop "Innovative Internet Community Systems 2003" held on June 19-21, 2003 in Leipzig. IICS 2003 was the thirdworkshopintheIICSseries.Thepurposeofthese workshopsisto bring together researchers in the area of system and information management for the Next Generation Internet (NGI). Like the preceding two workshops, IICS 2001 and IICS 2002, this year's workshop was organized by the Gesellschaft fur ] Informatik (GI) in Germany to support the exchange of experiences, results and technology in the area of focus. The 21 papers (2 invited, 19...