Rob Allen has written up a post about creating custom resources for your Zend Framework bootstrap process (for more see Matthew Weier O'Phinney's post here). In Rob's case, he wants to create one for a CouchDb interface.
In my case, I wanted to create a resource for CouchDb that checked that the database was created and if not, create it. Creating your own plugin is easy enough. The obvious place is library/App/Application/Resource
The code is quick and easy - a class that extends the Zend_Application_Resource_ResourceAbstract component and defines a basic init() method that pulls in the settings from the application.ini file for the "resources.couchdb" section. These settings can be used to create the connection or whatever needs to be done to set up the object for future use. You'll also need to add a line in the application.ini to tell the application about the custom resources directory too.