Tuese are some of the apps I have. They're all free. I apologize if I hit on some that were already listed, but I was just looking at my phone and not the lists on the other threads.
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Pandora - a must have if you like music
Barcode scanner - name says it all
Caller ID Faker - for the cost of listening to an add, you could clone someones phone number to make calls
Craigsnotification - Anytime the word Canoe comes up on Craigslist, I get a notification. You could set whatever parameters you want.
FIOS Mobile Remote - I have FIOS instead of Cable and this App lets me use my phone as a remote
Key Ring - Scan the grocery store cards or key fobs into your phone and use your phone instead.
Kindle - I've downloaded some free books from Amazon, but I have not actually read any.
ESPN Sportscenter - nuf said
PDA Net - supposedly, you could use your phone to act as a wireless hot spot for a computer.
Photoshop Express - name says it all
Safe Neighbor - find the pervs around you.
Shazam - Hear a song but don't know it's name or who plays it? Use this app to get that info.
Slydial - Ever have to call someone but didn't want to talk to them? this app will let you slide directly into their voicemail. "Honey, check your voicemail. I called you!"
TideApp - get tide info for surfcasting
Trapster - find out where cops are hiding
TV.Com - watch TV shows
Zillow - see which houses around you are for sale, click the link and see photos, prices, etc.