Actually, I disagree Kelkat - debit cards simply don't offer the same levels of consumer protections that a Credit Card does.
Last year I got badly burned at
Comet when mis-sold a home theatre system that wasn't probably compatible. I bought it on a debit card, and because Comet played close to the line, rather than over it, I couldn't demand a refund without taking the matter to court.
However, if I'd have bought it with a Credit Card, I could have taken the issue to the Credit Card company, who would have been much more likely to ensure I received a refund.
Credit Cards really do have extra consumer protections over a debit card, and personally I always make large purchases on a credit card these days - to be cleared at the end of the month - simply for those extra protections.
Once I got burned spending a couple of grand on a debit card, I don't plan to ever repeat that.