Digit-Decoder
The book, Extremely Loud and Incredibly Close by Jonathan Safran Foer, contains a message typed entirely in phone digits. The message spans two and a half pages.
I am building this application as a tool to use to decode it. Also, I thought it would be a challenge from which I could learn some things.
Working Prototype
Try out the working prototype at http://mike-eng.com/sandbox/digit-decoder/