Books, Wikis, Documentation and Forums

Book: Mastering XPages

 Book: Portable Command Guide

 Book: Extension Library

 StackOverflow
IBM Application Development Wiki

 IBM Forum

 IBM Lotus Domino Documentation

 IBM DeveloperWorks
YouAtNotes XPages Wiki

 IBM App Dev WhitePaper

 Book: Redbooks Wiki

 Cheat Sheets
OneUI Documentation

 Lotusphere 2012 Presentations

 Slideshare

Open Source, Videos, Podcasts and Blogs

Open Source: OpenNTF

 XPages.info Tweets

 NotesIn9 / XPages.TV

 Taking Notes Podcast
This Week in Lotus

 OpenNTF YouTube Channel

 Blogs

 The X Cast
XSnippets

Commercial Training

The Learning Continuum Company

 XPages101

 IBM Education Offerings

Commercial Services

IBM Software Services for Lotus

 ZetaOne

 PAVONE

 London Developer Co-Op