Some time ago I posted a gist for a command line utility that automatically nib2cibs changed nibs. During the weekend I've rewritten the utility, making it more reliable with newly created nibs and nibs containing resources.
Take a look at the README for installation instructions. After installing you can start monitoring your nibs by running
autonib2cib <resource directory> in your terminal.
Cappuccino has been very successful at preserving the customary 'code and refresh' workflow for web developers. However, as any developer with more than a handful of cibs knows, having to manually run nib2cib breaks this workflow. Autonib2cib will solve this problem by automating the nib2cib process.