The question is quite simple : I have a controller plugin for Zend Framework.
Should I put it in the \"library/Plugin\" folder, or in \"application/plugins\".
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I generally put everything that is specific to my application, e.g. not reusable without modification into the appropriate application folder.
For generic plugins, I create a new folder in library. This folder is modeled after the Zend library folder concerning names, e.g. My/Controller/Action/Helper or My/Controller/Plugin, etc. Putting stuff there is optional though, as you might as well put this in the appropriate application folder as well. I just like the distinction.
I never put anything into the standard Zend distribution. This would get lost when updating.