While surfing and looking for some TBS board games, I found Battle of 1815 - Waterloo (http://www.battle1815.com)
It's based on German Kriegsspiel rules and looks a bit like chess (layout and stuff) but it provides some nice strategic features.
I like especially the lines of communication which are required to command your army.

So if you are looking for a simple but nice turn based strategy board game...have a look and tell me - I want to play some battles ;-)