Jesse, I'd like to see:
1. Player handout maps, the kind PCs might buy from rumormongers in a market, not knowing how much of the map is true - a tattered scroll purporting to show the route from a secret door to the inner sanctum of the Beast Lord temple, a wilderness trail leading to a stream that runs over a bed of jacinths, or the "I cased it, you robbed it map" of a loner thief after he checked out the Serpent Tower vault and decided it was too tough for him - that kind of thing.
2. Scale floorplans that you can put figures on. Floorplans of entire building floors, and big, not just small random terrain bits as Dungeon (or was it Dragon?) had a couple of times a year or so ago.
3. Player handout portraits, perhaps with stats in the accompanying article, for DMs to hand out to players.
4. Player handout traps, dungeon scenes, murals, frescoes, mosaics, perhaps with hidden codes/tricks/secrets worked in pictorially. Somewhat a la Tomb of Horrors/Kenzerco KoK module style, but with a puzzle in each picture. For a crude example, the Duke takes the players into his portrait parlor, pulls aside a curtain to reveal a medusa painting, and says to the players - "How many snakes in her hair? Tell me in ten seconds or you'll be turned to stone." And the players have to count quickly on the picture the DM hands out and say how many snakes. That's not suitable for everyone's style, perhaps, but you get the idea. A more intricate, untimed puzzle like counting hidden pictures would be great. Alphabet puzzles with strange runes would be fantastic.