SongFight is a facebook game where users listen to songs and try to guess who's the artist. It's completely user-generated. Each user can create his own quizz and promote it.
Songs and metadata are retrieved from Last.fm and EchoNest.
Your Mashup not listed on ProgrammableWeb yet? Tell us about it and get listed.
Road Sign Math
Google APIlity Library
Flickr Puzzle Mashup Tutorial
Facebook ActionScript Library
C++ Client for Facebook
Javabook: Java Library for Facebook
Official Facebook PHP Client Library
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.