+1Originally posted by Khyron
Assuming you pay it off every month, you'd be crazy not to use a rewards card of some sort for every single purchase you can.
I have the RBC Avion Visa and use it for everything. I've transferred my RBC points to BA Miles during the 1.5x promotion twice now, turning ~133,333 RBC points to 200,000 BA Miles. A trip through Cathay Pacific (BA Partner) to Asia is 50K so it's worth it to me. I haven't redeemed anything yet though and Cathay only flies from Van so that's the downside.
I also have Air Miles and Aeroplan but they're pretty terrible programs imo. Best Buy Reward Zone is pretty cool if you buy a lot of electronics.
I have the PC Financial MC for PC Points but never use it anymore since I pay an annual fee for Avion.