It's really amazing the difference in taste between freshly roasted beans and beans that have been sitting on the supermarket shelf for weeks. Time takes a huge toll on flavor, as does exposure to oxygen and harsh light, so bulk buys and long storage times are not your friends in the java game. For the best brew, go to a local roaster to buy your product, and make sure the roast date (which coffee-conscientious sellers will print) is within the past couple of weeks.