i guess i should elaborate a little bit more
google sky map is awesome for finding any celestial thing you might want to find (the north star being a good one if lost)
dice wars is just the best strategy game thingy for general time wasting, though the phone version isn't *quite* as good as the flash or .exe versions of the game
yelp is awesome if you need to find a place to eat
periodic droid just makes for a nice reference if you ever need to like..suddenly know what tungsten is used for >_>;;
nyan cat is nyan cat
compass is alright if lost
flashlight is good for obvious reasons, though since you lack a flash that sorta dampens things, but eh...always the low tech method of just using a lit up phone screen >_>
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There is no shame in not knowing; the shame lies in not finding out