MADALGO sponsored some of the invited speakers at ALGO 2009, the annual meeting combining the European Symposium on Algorithms (ESA) and a number of smaller, specialized conferences and workshops. With hundreds of participants, ALGO is the major European algorithms conference. The conference took place on September 7 through 11 at the IT-University (ITU) in Copenhagen. The event included an invited talk by MADALGO core researcher Erik Demaine, as well as a bike ride from ITU to the Copenhagen town hall with participation of the Danish Minister of Science, Technology, and Innovation Helge Sander.