It's an expensive piece of cardboard. (In fact, two expensive pieces of cardboard - the Deluxe D&D screen and the Deluxe d20 Modern screen).
I rarely consider DM screens to be "worth it" in 3E - most of the information you need is in your adventure notes and the Monster Manual, not the screen. (Unlike 1E, where you really needed a screen for the Combat Matrices!)
However, I do like the D&D screen. I appreciate the landscape format - I have a fairly high table we play on from time to time, and it's nice being able to see the players again.
Tables:
Far Left Panel:
* Common Armor, Weapon, and Shield Hardness and Hit Points (PH 166)
* Substance Hardness and Hit Points (PH 166)
* DCs to Break or Burst Items (PH 166)
* Items Affected by Magical Attacks (PH 177) - that's useful!
* Size and Armor Class of Objects (PH 166)
* Object Hardness and Hit Points (PH 166)
* Walls (DMG 60)
* Doors (DMG 61)
Left Panel
* Turning Undead (PH 159) - useful!
* Increasing Weapon Damage by Size (DMG 28)
* Decreasing Weapon Damage by Size (DMG 28)
* Influencing NPC Attitudes (PH 72)
* Attack Roll Modoifiers (PH 153)
* Armor Class Modifiers (PH 151)
* Missing with a Thrown Weapon
* Climb Check DCs (PH 69)
* Listen Check DCs (PH 78)
Right Panel
* Actions (PH 141)
* Concentration Check DCs (PH 70)
* Skills (PH 63)
* Ability Modifiers (PH 8) - very useful!
Far Right Panel
* Movement and Distance (PH 162)
* Maximum Distance for Spot Checks - useful!
* Light Sources and Illumination
* Hampered Movement (PH 163)
* Armored/Encumbered Speeds
* Detect Magic (PH 219) - useful!
* Detect Evil (PH 219) - useful!
That's it. Overall, I think the screen's great, though the price - as always - for a screen makes me blanch.
Cheers!