@Mmmm_Big_Tasty Couldn't care less for PC gaming... but I've never heard of anyone ever "wanting" to use a Sony pad on a PC... 360 controllers certainly but never a Dualshock.
@tom2750 The left stick, the one for controlling movement, on the 360 is level with the face buttons... where it should be, hence the original PS pad having the D-pad opposite the buttons.
Sony haven't changed the basic layout since day one... and I think there may be a copyright/patent on the stick positioning so they'd have to pay to change the left stick position to the more natural place.
Ian-Cognito's comments