The Ontario Annual Guideline amount for 2011 has been set at 0.7%.
This means that your landlord cannot increase your rent in 2011 by more than 0.7%. So, for example, if you rent is $1000 per month, the maximum your landlord can increase it to is $1007. Your landlord must give you 90 days written notice to raise it.
The Annual Guideline also sets the percentage of interest that landlords must pay tenants on any rent deposit they are holding (i.e. "last month's rent").
For more information on rent increases, rent deposits, above-guideline rent increases (if your landlord applies to the Landlord and Tenant Board for permission to increase your rent above 0.7% because of an increase in operating costs or to cover major capital expenditures), or interest on your last month rent deposit, see http://www.cleo.on.ca/english/pub/onpub/PDF/landlordTenant/rentincs.pdf or call the Tenant Hotline at 416-921-9494.