There is a new credit card out that appears to be Canada's best cash-back card with no annual fee. Per RFD, the card is still available from creditrsvp.com with the code CHSS.

MBNA Smart Cash Credit Card - Canada's Best Cash Back No Fee Credit Card - New 2009

MBNA Smart Cash has the following cash-back/rebate:

• 5% cash-back on eligible gas and eligible grocery purchases (so yay to places like Loblaws, nay to Walmart) for the first six months.
• After the first six months, this becomes a still very respectable 3% cash back return on these purchases.
• For all other purchases, 1% cash back with no cap and from the first dollar spent, none of this tiered junk here.