Yes, there is shit that gamers need to be good at. Here are some of 'em. I'd like us to list with a small explanation for each but if it needs to get deeper than that please take it to another thread and please do link to that thread from here if ya please. Also, links to other techniques or AP examples of techniques in action are great.
Scene Framing: Setting up scenes that flow and not playing the scene before you play.
I.E. Yes to this: "In the next scene, you are at the door to the Sorcerer's sanctum and his demon is grinning at you."
And not: "I want to set up my next scene. I want to jab my dagger down that demon's throat, kick down the sorcerer's door and behead that bastard while screaming my now dead lover's name and trashing his most precious books!"
Organizing Friends to Meet: I honestly didn't realize this was a skill gaming taught me until I had to get people together for my girlfriend's birthday a month or so ago and it was just like gathering people for a game.
Pitching Game Ideas that Excite Friends: This is a big ole deal. Via e-mail or in person, it really is like an elevator pitch.
Constructing Situations that make for rich gaming: Examples: you are knights at a tourney all there to swear allegiance to secret society, orcs caught behind enemy lines in elvish lands, Naval investigators aboard a warship that is circling a top secret island known as Ry'leh, etc.
Finding good bangs on a player's character sheet: Looking at those character sheets and the NPC's the player infers and finding the hand-holds, like rock climbing.
Creating good opposition: I think back to my D&D games and how shitty I was at this.
Supporting another player by taking a back seat once in a while: We really can give another player a big boost, even by just knowing that they have the trait, BAD-ASS Swordsman and acting a bit in awe of their skill rather than being a flippant jerk.
Also just sitting back at times and letting the conflict that you know is important to a different character play out, while still having a part and adding your bits to the mix is a real balancing act, I think.
Being a proactive player: This has become synonymous with engaged and bought-in player to me but I find that this isn't everyone's experience. This one might become its own thread.
A touch more on any of these without any one becoming its own thread?