The Professional Wargame League is running kriegsspiel-style wargames by email over the internet!
PROWLeague emphasizes Fog of War and Command & Control in their games. In addition to gaming, the PROWLeague also has an educational goal: to support and encourage the development of good leadership and communication skills. Find them at: prowleague.com.
PROWLeague's games are patterned after real army Command Post-style wargames. Umpires handle game mechanics, allowing players to focus on Strategy and Command. They have just finished the Napoleonic battle of Marengo. You can read the After Action Report/Debriefing on this battle in their e-magazine: The Dispatch.