So, my solution was to write a Node.js module that would send a growl notification to the user when the compile was finished. I made use of the growlnotify command line plugin for OSX.
To use, you need to first install growlnotify.
Then use NPM to install the package `npm install coffeescript-growl`
Finally, require (with -r or –require) the module when you compile your script. I like to use something like this:
`coffee -r coffeescript-growl –watch –compile ~/sites/my_project/scripts.coffee`