LaTeX Guide

Anyone know of a decent introduction to LaTeX?

I know I can happily write LaTeX files in Ubuntu using the default word editor (and it even highlights all the extensions) and I know I can edit tex file in Windows using Notepad++ as it does the same.

However a good getting started guide would be good, possibly in book form (thought the LaTeX guide at Wikibooks seems very good so far)

http://www-h.eng.cam.ac.uk/help/tpl/textprocessing/LaTeX_intro.html