Napoleon -Total War: http://www.totalwar.com/napoleon/
Modding
Total War Centre: http://www.twcenter.net/
Total War Org: http://www.totalwar.org/
Europa Barbarorum: http://www.europabarbarorum.com/
Fourth Age: http://www.thefourthage.org/
History
Napoleon, His Armies and Enemies: http://napoleonistyka.atspace.com/
The Napoleon Series: http://www.napoleon-series.org/
JSTOR: http://www.jstor.org/
NYPL Digital Gallery: http://digitalgallery.nypl.org/nypldigital/
Clans
Napoleonic War Gamers: http://nwg.freeforums.org/
Napoleonics: http://www.napoleonics.org/
King's Own: http://s13.invisionfree.com/The_Kings_Own/
Grognards: http://www.grognards.org/
Napoleonic Battle Corps: http://napbc.freeforums.org/
Other
95th Rifles: http://www.95thrifles.com/