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Unix Text Editing 
XEmacs Tutorial GNU Emacs Manual [Mirror]
A Tutorial Introduction to GNU Emacs Unix Text Processing
O'Reilly® Learning the vi Editor [Mirror] [Mirror] [Mirror] [Mirror] [Mirror] [Mirror] [Mirror]
The VIM (Vi Improved) Book (PDF, 572 pages) [Mirror] VIM Quick Reference Card
Vim Cookbook (S. Oualline) Vim FAQ
VIM Regular Expressions (Oleg Raisky) Vim as XML Editor (Tobias Reif)
VIM Color Editor HOW-TO (A. Vasudevan) [Mirror] Sed - An Introduction