I personally don't even consider the 1440x900 glossy an option, it's high-res or bust (eyesight allowing), so the 'HR-GLSY' vs the 'HR-AG' (as labeled on MBP CTO/BTO packaging).
I have the HR-GLSY screen and absolutely love it, of course I'm partial to glossy and do not notice the glare at all, I like how the colors pop on it compared to the AG screens, I came from a BlackBook Core Duo to a Penryn BlackBook C2D, to a 13" Unibody MB which I traded w/ cash for a 15" Unibody MBP (Late '08 models both) and now have this Mid-2010 2.4Ghz i5 HR-GLSY as a warranty replacement of the 15" Late '08 machine.
Cleaning the older BlackBooks were a chore, yes they were glossy still, but the bezel unevenness lead to dust in the screen which was annoying to me, I have to have the screens totally clean and am always rubbing at mine to remove specs as I find them while I'm working, of course to battle the dust problem on my PC w/ 2 Dell 2407WFP's I have them above my line of sight by a tad bit and then angled down so that physics takes care of the dust issue. Also on those two displays I have to power them down and let them cool off before cleaning them and then I have to be very careful, it's not something I could do on the road quickly with a laptop, I'd have to pay attention to it, the glass does make cleaning this machine a whole lot easier.
I am not sure if the glass adds any structural rigidity to the screen and I'm sure everyone will have their own opinion on that but it's certainly much better with the aluminum/glass covered displays than it was with the BlackBooks which were plastic all around.
I also take my machine everywhere with me, inside, outside, at school, at home, friends houses, in my car, w/e. I do not have issue with the gloss, yes it exists, but it's not as insane as you guys put it out to be, and I'm the guy who wipes off every spec from the screen.
So yeah, not sure what I just all said, but if someone finds something useful up there, yay.