PlayStation 2 is the best-selling game console of all time. First released in Japan 20 years ago this week, it sold over 158 million units over its lifetime. When the system was released in the U.S. in October of 2000, it sold half a million units on the first day, instantly making the PS2 the fastest-selling game console ever. Sony shipped 100,000 units a week for the rest of the year, and availability was still spotty for months thereafter. I asked for one for my birthday in January of 2001,