Yes, it is a coating. I guess that is fine between you and the panel, gotta love that screen door effect.
See...these comments make me think that these people have never see the AG displays on MBPs. It's really not that hard to comprehend. The glossy ones have a hard glass surface over the screen. The AG ones don't have that, it's just the ye old squishy to the touch LCD panel. It's not a coating. If anything the glossy ones have a "coating". Stop trying to convince everyone the world is flat.
Screen door? What decade do you live in? On a 17" 1920x1200 panel you won't see a screen door unless you get less than 6 inches away from the screen. It's almost "retina" by Apple's definition. If you need to get that close you have other things to worry about than seeing pixels on a monitor. Besides..ALL displays have "screen doors" what do you think a pixel is? Some just stick a plate of glass or plastic on top.
On a side note...I've always wondered what the screen looks like if you take off the front glass on glossy MBPs or iMacs.
On another side note, I now feel like a true MacRumors user. That was probably the most obnoxious post I've made. I feel like I'm part of the club now! LOL!