3% cash back for gasoline purchases (up to $3,000 per year, then 1%);
3% cash back for restaurants;
2% cash back on travel
1% cash back just about everywhere else including at Costco.
These cash back amounts are more valuable than just about any card I've ever seen (not to mention that a lot of cash back cards only give you cash back if you carry a balance/make interest payments, which pretty much defeats the purpose of the cash back bonus).
But the cash back bonus isn't the only positive. This card also offers:
No annual fee (for Costco members)
0% interest for first 6 months, then 11.99%
$25 credit when you make your first purchase
For Costco fans, like myself, this credit card also acts as your Costco membership card which allows you to cut space in your wallet by not carrying your membership card (a minor, yet satisfying plus of this card).
I used to love seeing my membership awards balance climb when I used my credit cards to make purchases, knowing that I'd be able to eventually get a free flight or two with the miles I was accruing. Its much nicer getting a check (or even cash) from Costco when my rebate is ready. Now I can buy those same plane tickets, plus pay for my hotel room, with straight cash money.
I highly recomend this Amex Credit Card for any Costco members out there.