I like the Chase PerfectCard:
http://www.chase.com/ccp/index.jsp?p...ourcecode=9D66
You get 3% back on all gas purchases, regardless of brand. 1% back on everything else. Only get these type of cards if you plan on paying off your balance every month. Typically these cards have a higher interest rates as opposed to non-rebate, non-cash-back cards.
later,
Curt