Miscellaneous LaTeX-documentation
A beginners introduction to typesetting with LaTeX Peter Flynn
A rather modern beginner's guide
Latex and Friends M. R. C. van Dongen
Another guide
The Not So Short Introduction to LaTeX2e Tobias Oetiker et al.
The manual considered standard apart from Lamport's book.
Att skriva rapporter med LaTeX Per Foreby
The LaTeX-manual from the E-house
Higher Mathematics Gossens, Mittelbach, Samarin
This is an unsurpassed description of AMSmath.
Using Imported Graphics in LaTeX2e Keith Reckdahl
Everything about images in LaTeX. High quality.