If someone is looking for a good rewards card (in the US), I suggest taking a look at the Costco/Citibank card.

1% cashback on most purchases. 2% at Costco (requires membership). 3% at restaurants and pre-selected travel related purchases. 4% on gas. Requires Costco membership to redeem cashback.

In my opinion most people are better off with Fidelity's flat 2% card on all purchases ("Rewards Visa Signature Card"). No annual fees.

To bad Citibank is removing their price protection off their cards.