You can probably tell that I really, really like the Emacs text editor. Here are some of the posts I've written about Emacs over the past few years. I'm also writing a book about Emacs called "Wicked Cool Emacs", to be published by No Starch Press. Keep up with it through my blog posts tagged wickedcoolemacs!
For more Emacs posts from other people, check out Planet Emacsen. For all things Emacs, check out the EmacsWiki.
Geek: How to use offlineimap and the dovecot mail server to read your Gmail in Emacs efficiently
Wicked Cool Emacs: BBDB: Import CSV and vCard Files
Wicked Cool Emacs: BBDB: Work with Records
Wicked Cool Emacs: BBDB: Set up BBDB
Wicked Cool Emacs: BBDB: Use nicknames and custom salutations
Wicked Cool Emacs: BBDB: Keeping track of contact dates
Chapter 6: Being Big Brother (plan)
Chapter 7: Managing Your Notes in Emacs - done!
xkcd: Real programmers use Emacs
Note-taking: Random notes, journal entries, outlines, and hyperlinks
Writing plans for the chapter on managing notes
Tagging in Org - plus bonus code for timeclocks and tags!
How to use Emacs Org as a Basic Day Planner
Emacs: Getting Things Done with Org - Basic
Emacs: Choosing between Org and Planner
Publishing my Org agenda to my blog