The Preeventualist Lost and Found Service
The Preeventualist Lost and Found Service was a web service introduced in chapter 6 of why’s Poignant Guide to Ruby. It drove a few exercises, which centered around writing a library to access an ultra-simple REST API. Unfortunately why didn't open-source the code before he disappeared from the internet, so the exercises have been broken for a few years. Boo!
This reborn version of the service is 100% compatible with the API specified in the Poignant Guide, but also adds some new features like JSON and Brooklyn Integer support.
Do you really have to ask?
Where to find it online
Nowhere, I haven't put it up on a public server yet.
The source code is licensed under the WTFPL. See COPYING for details.