I agree with Batteryman that a layout guide would be helpfull. I thankfully used the mentiones layout map with my 1.2x versions, as I do not know much about CSS.
In 1.3x versions I was completely lost with my layout, and spend a lot of time figuring out what was what.
My answer to Kobra's post: it would be impossible to cover everything. But a layout guide could at least give an impression of the way the CSS is setup, so newbies like me can get an idea of the system of the new CSS, and understand the basic selector groupings.
For details or different page specific items indeed firefox developer works great.





