This volume contains the Proceedings of the XVIIth ISAC Meeting held in Valladolid, Spain, July 1-5, 2008. As such, it contains the most permanent records of the combined efforts of all attendants. The meeting was held at the School of Medicine of Valladolid, that had the privilege of a recent celebration. The celeb- tion was none other than its 600th anniversary, implying that all participants were surrounded by historical landmarks, from the historical building of the University, to the Museum of polychrome sculpture of Valladolid, to the Monastery of Clarisas in Tordesillas, to the beauty and charm of Salamanca. In this ambience we had three days of intense work, distributed in several oral sessions, preceded by plenary lectures given by our invited speakers who were kind enough to provide us with the latestprogressintheirspeci c elds. We also hadtimeallottedtoposterviewing. As regularattendantsto the XVIIth ISACMeeting, we want to expressourappreciation forthevaluablediscussionssurroundingeachposter, theenthusiasticpresentationof data, the comments of colleagues with suggestions for improvement, and the plans for collaborations that emerged from these discussions. Needless to say that XVIIth ISAC Meeting was the fruit of many collabo- tive efforts. The Local Organizing Committee pro ted from the advice of several colleagues from around the world, namely, Prof. Chris Peers from Leeds, UK, Prof. Prem Kumar from Birmingham, UK, Prof. Nanduri Prabhakar from Chicago, USA, Prof. Colin Nurse from Hamilton, Canada, and Prof. Rodrigo Iturriaga from Santiago, Chile.