Dan Brown offers A l’Ombe des Aigles, a set of free miniatures wargaming rules for Napoleonics miniatures.
Cannonade is a Napoleonic era board style wargame designed to be played on a hex board. While the board isn’t provided, the game does include counters for you to print out.
The Evolution of Napoleonic Uniforms website is an ambitious work. It is not by any means complete (could any project of this scope ever be complete, given the number of variations?), but is worth browsing through.
This site has some pictures and diagrams from the Sharpe film that centered around La Haye Saint. This is an outstanding resource for anyone wanting to build their own model of the farmstead.
When I first started playing Napoleonics, I was lost. There were so many characters and places and battles and politics and subterfuges. I enjoyed moving the lead around, but it was years before I felt I understood the greater background. If you want to break in a newbie, point him to this site.