For us, everything goes on the credit card, groceries included. We pay it in full at the end of the month, though. That's how we get our airline miles.
Credit card. We also pay the balance in full every month. We get 2% cash back deposited directly into DD's college account. We usually get around $75 to $100 per month in addition to our regular monthly contribution!!!
I always use my Debit card. It is so convenient and easier for me to do than try and figure out how much cash to bring and I hardly ever use checks anymore thanks to my Debit card.
Usually cash, occasionally debit, rarely credit card--and then, only when shopping at walmart, because I keep forgetting I can't use my bank's debit card there because I don't have the pin (I usually use it as a CC, but it comes out of my bank account).
Like beattyfamily, I rarely use checks. If I knew the pin to my debit card, I don't know that I'd use them at all.
Credit card and we pay it off every month. One card gets airline miles; the other one gets 1% back on every purchase. We get a check for around $200 every summer since we use the 1% card on so many things. Our gas credit card gives us 5% back in credit - $8-$10 a month .