OK, I own a PS3 and a 360 but prefer the 360 controller's size and heft. In other words, the PS3 controller is for little boys (but I do like the blu-ray). All this to say: I myself am interested in the 360 answers more than the PS3 answers but feel free to dual post because I know some of you are little boys!
Also if you have your own questions about the game that fit the title please neatly number (2 comes after 1 and so on) them and add them to this thread if you care to.
Now then my friends, gather round for we will make our game yet more sound.
I've read the PDF on 2009 gameplay and came away with a couple questions.
1. How exactly does one
trap the ball? Is it simply holding the left trigger for better control prior to receiving the ball? I've noticed occasionally that if I tap the A button exactly when I receive a pass this has some settling effect. But surely this is a fluke because who would make the pass button the trap button? Not EA right?
I dont know exactly what you mean, and I'll assume the A button is the triangle since I own ps3 because I am a little 25 year old boy 
. when I make a long pass trhu air, I hold the r2 works like a charm, the player wont make the ball bounce , he will intercept it with the chest and keep it close to the body.
2. How does one jostle whilst running? There's the left trigger mod which supposedly gives you pace control allowing one a stronger center of gravity but this slows one down. Not to mention I've seen the "strong" jostling done at full pace, not the "pace control" speed. So, what's the secret? How do you make your player push (or not be pushed by) other players? Is it right thumb stick to lean and left thumb stick to run?
I used to run and keep on pressing the L stick to the direction I was running towards, but sometimes the tricks wouldnt work. I "discover" that letting go of the L stick but still running and immediately do the juggle or trick will work all the time, at least it does for me now. I dont believe there is a button to push. just happens randomly depending on how your players is moving, what he is doing with the ball and strenght of course.
3. Does the "shield ball" technique work? I always seem to get tackled off the ball almost instantly using it and so I quit using it. Perhaps it's related to #2 question in that you have to lean into the opponent to counter him? If so, how? Is it just left thumb stick?
it does work excelent, but just one suggestion: dont try it in your own half especially near your goal, because you would mess it up like I have many times 
whether the opponent gets the ball away from you even when you are shielding it, depends on strenght difference between the 2 players.