1. Out Of Milk
A shopping list app, with all the regular features, but the cool thing about Out Of Milk is you can share lists, with your partner or your housemate. This means that if one of you runs in to buy say, Cornflakes and skimmed milk, then those items are taken off the joint list. You can also add additional details (like a preferred brand etc), and the pantry section shows you all the items you already have.
2. Word Lens
Need to translate a sign in a foreign language? Word Lens can help with that. Just hold up your phone's camera and it will do the rest.
(Bear in mind you have to buy language packs within the app. Currently: English/Russian, English/Portuguese, English/German, English/Italian, English/French, English/Spanish.)
12. Select Who
No more wasting time making decisions. Who gets the last piece of bacon? Who chooses the film to watch? Let this app streamline your choices.
Get it on Android.
Make your *phone* more efficient. You can help to study diseases, predict global warming, or discover pulsars, by allowing the Berkley Infrastructure for Open Network Computing to run jobs using the unused computing power of your device. Basically this means that within parameters (like, when plugged in, on wifi, with a good battery life), your phone can collect, compute and transfer data for any number of scientific projects within the scheme. Cool!