Bayesian Clustering Algorithms for Population Genetic Data
Structure Tutorial
Structurama Tutorial
Delimiting Species Using Trees
Brian O'Meara's species delimitation lecture: 
OMearaSpeciesDelimLecture.pdf.
Conceptual Issues in Taxonomy and Species Delimitation
Kevin de Queiroz's papers and lecture on contemporary species concepts.
Brent Mishler's discussion and lecture on rank free taxonomy.
