Undergraduate Debt Causes ‘Pipeline Leakage’ to Graduate Study (Report)

African-American students who graduate with no debt are 1.71 times as likely (71% more likely) to enroll in graduate and professional school than African-American students who graduate with some debt:  http://www.finaid.org/educators/20101122gradpipelineleakage.pdf 

Also:
http://www.fastweb.com/financial-aid/articles/3092-how-to-minimize-student-loan-debt