• A (Not So) Short Introduction to LaTeX2e
• Obsolete commands and packages
• A beginner’s guide to LaTeX
• LaTeX for Complete Novices
  Gentle introduction to LaTeX by Nicola L. C. Talbot, available in HTML and PDF, v1.3: 2008-01-15
• Getting to grips with LaTeX
  Tutorials by Andrew Roberts
• Online tutorials on LaTeX
  by the Indian TEX Users Group
• latex-course
  slide presentation introducing LaTeX

You will find a lot more in the TeX Catalogue Online:

• References and Manuals

If you are interested in documentation in german language visit the Homepage of the LaTeX-AG of matheplanet.com.