flashlight-self explanatory
urbanspoon- restaurant guide
around me- tells you whats close to you ( bars, hotels, hospitals,food....)
now playing - tells you whats at local movie theaters, times
remote - allows you to control your itunes on your desktop/laptop from your iphone
airsharing- allows you to transfer files from phone and computer wirelessly
facebook for iphone
those are some i like and absolutely Shazzam like tomson75 said