Ebooks/Tutorial on TeX and LaTeX :-
TeX and LaTeX :-
Making TeX Work (by Norman Walsh) [Link]
A Beginner's Introduction to Typesetting with LaTeX [Link]
A Gentle Intorudction to TeX (Machael Doob) [Link]
Math into LaTex: An Introduction to LaTeX and AMS-LateX [Link]
The teTeX HOWTO: The Linux TeX Guide (Robert Kiesling) [Link]
TeX by Topic (by Victor Eijkhout ) [Link]
Getting Started with LaTeX (David R. Wilkins) [Link]
A Simplified Introduction to LaTeX (Harvey Greenberg) [Link]