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The Witcher

X ------------------------ Activate (attack/talk/pick up)
Y ------------------------ Strong Style
B ------------------------ Fast Style
A ------------------------ Group Style

Select + Y ------------- Potion Quicklstot 1
Select + B ------------- Potion Quickslot 2
Select + A -------------- Potion Quickslot 3

LB ---------------------- Cycle Magic
RB ---------------------- Cycle Magic
LT ---------------------- Pause
RT ---------------------- Magic
Select + LT ------------ Highlight Objects
Select + RT ------------ Sheathe/Unsheathe weapon

(If you already have the weapon selected, pressing it again will jump through modes.)
DPad Up ------------------- Steel
DPad Right------------------- Silver
Dpad Left ----------------- Extra Weapon 1 (big)
Dpad Down ----------------- Extra Weapon 2 (small)

Left Analog ------------------ inventory
Right Analog ----------------- Map
Start ---------------------------- Journal
Xbox button ------------------- Main menu

Select + Left Analog -------- QuickSave
Select + Right Analog ------ Quickload

XBox Home + Select -------- Shift + Tab
(To get rid of that annoying box at startup)

(If you can't skip through the starter movie, ESC on keyboard is the only way I've found around it. If your cursor disappears when trying to load your game, hold down the SHIFT key and it will appear. Everything works flawlessly after that.)