Special issue devoted to the 15th ILAS Conference at Cancun, Mexico, June 16-20, 2008. Papers should be submitted by October 1, 2008 to one of the special editors: Daniel Kressner, Beatrice Meini, Vadim Olshevsky, Jeff Stuart, Luis Verde-Star. Additional information may appear in due course in the conference announcements and at http://www.math.wisc.edu/~hans/speciss.html. The responsible editor-in-chief is Hans Schneider. Daniel Kressner Seminar for Applied Mathematics ETH Zurich 8092 Zurich Switzerland kressner@math.ethz.ch Beatrice Meini Dipartimento di Matematica "Tonelli" Universita' di Pisa Largo Bruno Pontecorvo 5 56127 Pisa Italy meini@dm.unipi.it Vadim Olshevsky Department of Mathematics University of Connecticut 196 Auditorium Road, U-9 Storrs, CT 06269 USA olshevsky@math.uconn.edu Jeff Stuart Mathematics Department Pacific Lutheran University Tacoma, WA 98447 USA jeffrey.stuart@plu.edu Luis Verde-Star Department of Mathematics UAM Iztapalapa Apartado 55-534 Mexico DF 09340 Mexico verde@star.izt.uam.mx 5 Nov 2007