Does anybody know of a plugin (or other method) that would allow admin to set up certain areas of the site (from pages to posts to certain plugins) that users could access? For example, I want to retain admin rights to be able to add/delete plugins, manage everything normally. But the client wants to update her own site so I need to give her access yet I don't want her to have access to the settings page, the plugins (add/delete) page, and certain other areas.