The store chain I work for stopped charging pennies on cash transaction about a month ago, and rounding them down to the nearest nickel. We do however continue to use cents in credit and debit card sales. The "take a penny, leave a penny" dishes are gone from the counters, and those little plastic donation boxes on the counters are filling up with nickels, dimes, and quarters.
I still see customers come in with pennies once in awhile, and sometimes there are wheat pennies in with them. I try to keep some newer pennies in my pocket so I can exchange them for the older ones when I find them.