Happy Camper is a full-featured chat client for Campfire. It was developed as a Chrome extension and can be used to send and receive messages, join and leave rooms, receive desktop notification of new messages, and perform full-text searches.
The project website contains screenshots and technical documentation about Happy Camper's development. It can be found at http://roowii.net/projects/happy-camper.
The latest released version of Happy Camper can be downloaded from the Chrome Extension Gallery.