The term "Fog of War" refers to various methods by which uncertainty is introduced into our table top games. I am a great fan of them and recently posted one of the ways in which I introduce it in my games on my Saxe-Bearstein blog.
What are some of your favorite ways of introducing the "fog of war" in your games?
Don't answer here (game mechanics are not appropriate on EvE) but on your own blog or website . . . and then add a link in the comments section of this post.
Let us share some of the ways in which the "fog of war" can be introduced onto the table top.