Download Squad says Campfire is one of the 10 web apps you should be running on your Mac with Fluid. What's Fluid? A Mac app that can pull web applications onto your desktop and turn them into OS X native site-specific browsers.
Campfire, the popular team communication system from 37Signals, works so well with Fluid that 37S has released an official Fluid Icon for Campfire. Some great scripts, including Growl alerts when someone mentions your name in Campfire, can be found at Thoughtbot's blog.
