It is the best inventory of military heritage resource links that we have found yet. Just pick the time period your interested in. Museum of Applied Military History Homepage. The Brigade of the American Revolution. This reenactment organization has shown great leadership in improving the authenticity of the hobby.
Unit listings etc.
There are a number of articles on Scottish military material culture. 42nd Royal Highland Regiment. The Historical Reenactment Web Site. This UK site offers an ongoing inventory of reenactment societies of all time period with an on-line registration. There are also society web pages for groups like the Seven Years War 12th Regiment of Foot.