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.
Has the “Darkest Africa” fad passed? I hope not. The Wargames Foundry line of figures by Mark Copplestone and others sparked a hobby-wide interest in miniature wargames that were more role-playing oriented — adventure games, if you will. If you’re still playing darkest Africa games — or if you’re thinking about getting into them, here’s a good site with historical maps of Africa.
For you colonial gamers, here is a page with useful information on British and Commonwealth Orders and Decorations.
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.
Rules writers pay attention! Mike Willegal has written an analysis of the effectiveness of black powder muskets.