Tentative list of future official manuals suitable for our current documentation set available at plone.org.

 I suggest we follow the paradigms other CMSes and web framework have out there, so the developers feel more familiar.  Let's not separate Zope 3 from other stuff, since the separation have become irrelevant when new Plones roll out. Doctest format has proven to be very succesfully with Zope 3 documentation and integrates nicely with Sphinx. (mikko).

Developer reference guide

• HTTP request and response
  
• Views
• Registering
• Subclassing
• BrowserView
  
• ZODB and Archetypes schema model
  
• Creating objects
  
• Accessing objects
  
• Setting variables
• Transaction lifecycle
  
• Traversing and acquisition
  
• When it is applied
• Zope and Plone object hierarchy
  
• aq_parent
• aq_inner
• Acquisiton properties
  
• Lack of Middleware concept and alternatives
  
• Searching and listing content
  
• Accessing container children
  
• Listing folder contents (restricted)
• Listing folder contents (unrestricted)
• Appending container children
• Deleting container children
  
• Catalog vs. primary copy
  
• Interfaces,  adapters and component architecture
  
• Creating and interface
• Querying by interface
• Querying by interface name
• Adding an adapter
• Overriding an adapter
• Overriding an utility
  
• Viewlets
• Adding
  
• Subclassing
• Overriding
  
• Catalog
• Indexes
• Searching
  
• Forms
• Z3C form
• Creating forms
• Add form
• Custom widgets
• Custom fields
  
• Non-recommended methods: raw HTML, CMFFormController
  
• Content types
• Content type elements
• Run-time initialization (Five)
• GenericXML
  
• Schema
• Class variables
• Creating content types
• Extending contenttypes
• Publishing properties
  
• Archetypes machinery
• Creating widgets
• Creating fields
• Storages
  
• Schematas
• Views
• Aliases
• Default AT templates
  
• Security and permissions
• Roles and their relationship with users and workflows 
• Setting class security
  
• Setting module security
  
• Setting view security
  
• Member management
• Adding and deleting users
• Reading user properties
  
• Getting active roles
  
• Granting local role
• Removing local role
  
• Workflows
• Creating
• Extending
  
• Querying workflows
• Quering workflow states
• Triggering state transition
  
• Content rules
• Creating actions
• Creating triggers
• Assigning programmatically
  
• Events
• Listening
• Firing
  
• Cancelling
  
• Getting subscribers
  
• KSS 
  
• Performing KSS triggered action
  
• Adding custom operation
• Authentication
• Logging in
• Logging out
• Authentication backends
  
• Registries
• CSS
• Javascript
• KSS
  
• Portlets
  
• Caching
• Cookies
• Setting cookie
• Reading cookie
  
• Session data
• Session life cycle
• Setting session variables
• Reading session variables
• Modifying session properties
  
• Data transformations
• Streaming and large files
• Python scripts and RestrictedPython
• When it is applied
• Magic behind
  
• Differences to normal Python code
  
• Non-HTTP serving
• FTP
• WebDAV
  
• Testing
• Basic unit tests
• Functional testing
• Security testing
  

Development manual

• paster
  
• buildout
• pdb
• eclipse
  

References

These should be generated from sources. Lots of custom scripting and new microformats needed  for this, though...

• ZCML
  
• TAL, TALES and METAL (integrated) 
• DTML
  
• GenericSetup XML 
• Archetypes widgets
• Archetypes fields
• Stock content contes
• Stock CSS declarations
• Stock Javascripts
  
• Stock TAL slots
• Stock viewlets
• Stock portlets 
• Stock events 
• Stock interfaces
• Stock adapters
• Stock utilities
  
• Stock content rules
• Stock cookies
• Stock session data 
• Stock Python scripts
  

Theming

• Templating (TAL, TALES and METAL)
• How to modify Plone's theme
• How to develop a theme for Plone (there is a document that is very well written and is all you need in order to do the job of Plone theming)
  

Add your section and/or proposed manuals!

OLD STUFF for historical background:

Content management (see above for updated version)

• Export member data to CSV files
  
• Batch-adding users to Plone using CSV (Excel) files
  
• Using the Zope Undo system to “roll back” content
  
• How to manage portlets in Plone 3
  
• How to integrate external content into Plone
  
• How to Embed flickr, YouTube, or MySpace Content
  
• Creating content rule conditions and actions
  
• Publish Plone search queries on other web sites using syndication 
• Using collections
  

• Restrict the content types in the 'add item' menu
  

• How to handle Flash content 
• Versioning, history and revising content
  

• How to handle large files in Plone
• We have several add-on products that address this issue in various
  ways:
  
  plone.app.blob - http://plone.org/products/plone.app.blob
  FileSystemStorage - http://plone.org/products/filesystemstorage
  Reflecto - http://plone.org/products/reflecto
  Tramline - http://plone.org/products/tramline
  
  Plone 4, the next major version of Plone, is likely to include
  plone.app.blob
• This question is repeated monthly in plone-users
•  How to handle Unicode errors
• This question is repeated monthly in plone-users