As a result of a recently posted suggestion

and my inabillty to come up with a single layout that will serve all purposes

there are now 2 different Post Header layout to choose from. The one on the left like it used to be and a one on the top like it is/was.
There are two ways to select which one you want to use.
User Settings->Your profile-> Edit Options-> Thread display options ->Post Header Position.
Or when a thread is displayed
Display Modes->Post Header Positon
You may change back and as much as you desire.
Note: The left Post header has had lot of customization, etc. The Top one hasn't. I'll bring the top one up to date over the weekend.