Topological Defects A site with links to papers and workshops on topological defects in cosmology
Topological Defects This is an introductory set of lecture notes on topological defects, given to an audience with interests ranging from astronomy to particle physics.
Topological Defects in Cosmology A review by Ajit M. Srivastava of various topological defects in particle theoryu models of the early universe (in PDF format).