On a side note. I was wondering if there is anyway to make a 0603 smd LED activate while pushing a button like "X" or "R1"? I am considering this but I don't think I am quite on that level yet. I do know it will take a dremel for the directional and shape buttons.
lol.. it's easy as 3.14!
if I remember correctly.. please keep in mind i could be 100 percent wrong.
but i'm pretty sure all buttons have a ground that is only active when you push down the button. so you just take positive to your led to whatever voltage you need, and negative to wherever that buttons ground is located. for ps3 you would have to solder to the controller board since there is a membrane and the copper traces aren't directly under the button. google dualshock 3 pinout.
someone correct me if i'm wrong.