Editing

• Editing help (directly from Wikipedia)
• More advanced editing
• Magic words in Wikitext
• Extended image syntax

• WikiText CheatSheet
• Semantic MediaWiki extension's annotation help

Semantics

• Semantic MediaWiki extension's annotation help
• RDF Metadata in MediaWiki (not sure if this is enabled in our current version)
• How to export in PDF - this might be useful in the future to provide a way to export the project documentation and using the wiki as a content management system for the project directly.

General

• MediaWiki Wiki (also called "meta", for a reason I must say)
• MediaWiki User Guide
• MediaWiki FAQ