The Groceries application can be used to create grocery lists and keep track on what items you have already collected. The application can store multiple lists and one list can hold multiple items.
PhoneTime is a freeware Java MIDlet for mobile phones that tells you when it is ok to call your relatives and friends living all around the world in different timezones, and when better not to call because it is night there.
Because of very modest requirements (it only requires MIDP 1.0/CLDC 1.0) it should run on practically any Java-enabled mobile phone that has about 20 kB free memory to store the MIDlet.