This is a URL to an article about credit cards vs. debit cards. It explains a lot.
http://credit.about.com/library/weekly/aa080400a.htmHighlights:
*if you do not carry a balance, bonuses are more important than interest rates.
*the minimum of terms you should know when considering a credit card
*explains the differences between a debit card and a credit card in terms of:
--Unauthorized Use
--Purchase Protection
--Grace Period and Fees
--Credit History
*links to more articles and helpful websites