Funny that you say that.
I had already created one and was ready to post it but apparently I had to have a total of at least 5 posts before I was allowed to post any images or hyperlinks.
But I have now passed that limit and here is the picture. Forgive the crudeness. I made it in mspaint at like 2 in the morning. I've tried to include all pertinent information including furniture placement and speaker placement and direction.
As a reference the room is approximately 10' (front to back) by 15' (side to side) and the speakers are mounted about 1.5' above seated ear level.
http://c1.ac-images.myspacecdn.com/images02/27/l_337a2673640c419482dbb1638c3828e8.jpg
P.S.
I have recently moved the FL to the left side of the staircase, the Center and TV just to the right of where the FL speaker WAS, and angled both surround speakers slightly more toward the center of the room rather than pointed directly at the listener.
Also worth noting I generally sit on the left side of the couch.