This year's program was recently announced. http://www.google-melange.com/gsoc/events/google/gsoc2013 Applications from mentoring organizations have to be received between March 18 and March 29. If we would like PETSc to be a mentoring organization, we should start by sketching a few project ideas. There are a few such projects on this page, but we'd need to collect a few that would be interesting and feasible as a summer project. https://bitbucket.org/petsc/petsc-dev/issues?status=new&status=open