Examples of powerful LaTeX packages and techniques in use — a great way to learn LaTeX by example. Search or browse below.
How to use Spanish accents in LaTeX
A short example showing how to set up the correct packages in your preamble in order to use Spanish accents in your LaTeX documents.
A longtable + tabularx example
The ltxtable combines the functionalities of longtable and tabularx.
The trick is to put your longtable using tabularx-style X columns in a separate file, and then include this file in your main document using the command \LTXtable.
Tracking changes in LaTeX with "changes" package
The changes package, distributed with TeX Live, allows the user to manually markup changes of text, such as additions, deletions, or replacements. Changed text is shown in a different colour; deleted text is crossed out. The package allows definition of additional authors and their associated colour. It also allows you to define a markup for authors or annotations. (Here's another customised example using avatars for the author annotations.)
Automatic Glossaries in LaTeX
This example shows how to generate automatic glossaries with the glossaries package. For more information, there's a good guide in the LaTeX wikibook, and also in the package documentation.