Should you use reward credit cards? There is a nice article in the 11/4/07 issue of the Washington Post about those who play the credit card reward game. Go to http://www.washingtonpost.com/wp-dyn/content/article/2007/11/03/AR2007110300158.html.
Basically, read the fine print on credit card applications. Don't use the reward cards if you carry a balance because they charge higher interest rates. You must be disciplined in diligently paying off your card debt fully each month.
I play the game, do not carry a balance and receive over $900 back each year.
Jim