Canadian Revenue Agency Resources
http://www.cra-arc.gc.ca/menu-e.html

T.I.P.S. (Tax Information Phone Service) This automated phone service provides information to individuals and businesses	1-800-267-6999
Individual income tax enquiries Tax information for individuals, including personal income tax returns, installments, RRSPs, and the Working Income Tax Benefit	1-800-959-8281
Tele-refund This automated phone service provides information about your income tax refund.	1-800-959-1956
Businesses and self-employed individuals Business and GST/HST registration, payroll, GST/HST (including rebates such as the new housing rebates), excise taxes and other levies, excise duties, corporations, sole proprietorships and partnerships	1-800-959-5525
GST/HST credit GST/HST credit and related provincial and territorial programs	1-800-959-1953
Payment arrangements (income tax) Discuss income tax payment arrangements with an agent	1-888-863-8657

Great Information for Individuals:
http://www.cra-arc.gc.ca/tx/ndvdls/menu-eng.html

Great Information for Businesses:
http://www.cra-arc.gc.ca/tx/bsnss/menu-eng.html

Great Information for Aboriginal People
http://www.cra-arc.gc.ca/brgnls/menu-eng.html