I have a Senseo so I have no need to store ground coffee anymore, but for everyone out there that does, you need to check out the Metari Coffee Meter. The Metari is sleek chrome coffee canister (also available in white) that is coupled with a metered coffee dispenser. In Latin, Metari means "I measure" which is appropriate since one squeeze on the built in trigger measures exactly one tablespoon, so you can dispense the same amount of coffee into your filter every time. If you need more, just squeeze it again. Pretty cool way to store your coffee.
Metari - Coffee Meter Canister and Dispenser