Ken Kutaragi retires as company struggles to get back on form.
Blu-ray to blame, claims Sony.
But savings not carried over to the US or Europe.
MoreĀ US sales in February than Xbox 360 and PlayStation 3 combined.
Best-selling games console in the world.
Previous denials overturned by UK chief's comments.
President goes on record to rubbish rumours.
Playing catchup with Sony's PSP.
Sony didn't know what it was doing, and the Wii lacks resolution.