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Once you've charged $6,500 in a year, you get 5% back on grocery, drugstore and gas purchases and 1.5% on everything else vs. 1% for the average cash-back card. (Below $6,500 you earn 0.5% to 1%). Blue credits the cash to your account automatically, so you don't risk leaving rewards on the table. Interest rates start at 10.99%.



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Last updated May 14 2008: 4:17 PM ET