@jirekhursani: another option would be to freeze your credit card account. I know some credit card company like discover allow you to freeze up the account in that way you won't use it again or even if you wanna use it again; you can unfreeze to bring them back up.
I hav actually cut those cards so that i wont use it again and i would check the balace of those cards once a month if there is any unauthorized use of my credit card. Thats what I do primarily....