Note this from Buffalo's web site
"IMPORTANT NOTICE: We are installing a new computer system. As a result, applications submitted in March 2011 may take longer than usual to process. Our average processing times have been adjusted accordingly. If you wish to apply for a visitor visa, work permit or study permit, we encourage you to submit your application by mail. We cannot provide same-day service to walk-in clients at this time. Thank you for your understanding. "
http://www.canadainternational.gc.ca/buffalo/imm/studying-etudier.aspx?lang=eng