I had written a little guide when I was first learning how to use LaTeX, and I have republished a slightly spiffier, typo-free (I hope) version here. This document could probably be improved (again, I wrote it was I was learning the basics of LaTeX), but I think it still works as an adequate guide for getting the basics down.
Perhaps I will improve upon it later. I do plan on adding other LaTeX how-to’s as I learn them; my current project is getting down the LaTeX beamer class for presentations. So, stay tuned!