I use a DM screen (actually, its the original 1E screen... how 'bout that for nostalgia!), but usually just as a barrier to prevent the players from seeing my notes and maps. I rarely use the tables on the screen. Instead, what I use is a modified "Combat computer" from Dragon Magazine #74, an adjustable disk used for calculating "to hit". Covering the free space on the back and front of the disk are small-font charts, lists, and other information that I found over the years to commonly need during play. And the disk is never buried under material. I just balance it on the edge of the DM screen, and it's literally at my fingertips at all times.
The original Combat Computer was 1E, but I modified it for 2E (which I still play). You may be able to make out Strength and Dex adjustments tables, Armor tables, various situational combat modifiers, clerical undead turning, currency conversion, saving throw tables, int. vs illusion saves, dual-handed weapon tables, my own critical hit table (available on my website), thief backstabbing, non-proficiency penalties, a chart I use for lock difficulty, poison-related charts, cover vs. missile fire, and a few other things. Pretty much 95% of what I commonly need while DMing. It saves a heck of a lot of looking up stuff during play (seeing as the screens are often covered with stuff I don't actually use).
Perhaps I should digitize the original and post it on my website. ;-)
Denis, aka "Maldin"
Maldin's Greyhawk
http://melkot.com
Loads of edition-independent Greyhawk... maps, magic, mysteries, mechanics, and more!