anything with cash back. 3-5% on groceries/gas is cool , then usually 1% on everything else. I capped out on my citi card last year ( $300 max ). Then theres citimerchantnetwork, where you get more % back from different merchants, and this doesnt count towards the $300 max per year. Diamond.com , for instance, offered 8% back so right now im waiting on about $350 back from that =]