Ebooks/Tutorial on Vi :-
Vi Editor:-
Mastering the VI Editor Link
Vi iMproved (VIM) Link
Introduction to Programming in C/C++ with VIM Link
UnixWorld's Vi Tutorial in 9 lessons Link
Vi Helpfile Link
Vi Lover's Home Page Link
An Extremely Quick and Simple Introduction to the Vi Text Editor Link
Vi Text Editor Tutorial Link
The Vi/Ex Editor Link
VIM Quick Reference Card Link
VIM Documentation Link
An Introduction to Display Editing with Vi Link
Vim Cook Book Link
The Vim Commands Cheat Sheet Link
Elvis 2.1 Documentation Link