If you're like me, you spend every waking hour wondering where the moons of Jupiter are currently located. The orrery app will now show you where the moons of Jupiter are at any time, and how they are moving relative to Jupiter. It will also tell you the time of events such as satellite eclipses, transits and occultations, as well as whether or not those events will be visible from your current location.
More information can be found here:http://wiki.maemo.org/Orrery#Jovian_Moons