Some app ideas
I.P. dog-based social networking tool. Users p to leave a message, and sniff to read messages. Messages show user id, status, and a word cloud. Messages fade logrithmically
Augmented Reality Pac-Man. Uses googlemaps to play pac-man in real life on city streets. You choose bike or walking mode.
Hammer. An app to let you use your phone as a hammer. Not for the gifted