Quoted from jaytrem:Ideally I like to have one primary no annual fee card that give me a nice bonus. For that I use the Citi Double Cash card. You basically get 2% back on everything you ever buy. So if you do nothing else other than get that card, you will be saving 2% for the foreseeable future.
I also like to have 2 no annual fee cards that get me 5% back on rotating categories. One is the Discover Card and the other is the Chase Freedom. For the next 3 months Chase gives you 5% back on gas purchases, Discover was the prior 3 months, so that been nice.
I use the same exact cards for the same exact purposes.