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.
19th Century
Victorian Figures Comparison
Colonel Marbles at Frothers Unite, UK! has a gallery of Victorian miniature wargaming figures from various manufacturers. It’s particularly useful for those who like to do Victorian Science Fiction gaming.
Hougoumont Battle Rules and Scenario
From Matt Fritz comes this set of rules for using wargame miniatures to replay the fight for Hougoumont from the Battle of Waterloo.
Pictoral History of Costume
Braun and Schneider’s “History of Costume” was published from 1861-1880 in Munich. This website has the translated text and the original color plates, with more than 500 costumes. This is a great miniatures painting guide, especially for the “contemporary” (i.e., 1880s) plates of peoples in Europe, Africa and Asia.