Gamasutra Writes;

Video game hardware sales out of Japan show a week-on-week slowdown for the week ended May 17 as sales of every platform decline, according to tracking firm Media Create.

The feature-laden Nintendo DSi handheld sold 34,152 during the week, leading all other platforms for the second consecutive week. But weekly sales for the platform were down 20,000 units from the prior week.

Sony’s PSP followed in the second slot this week with 28,683, down from 43,000 the week before. Wii edged out PlayStation 3 for the second week in a row, selling 15,116 and 11,605, respectively, following a March and April that saw PS3 outsell Nintendo’s motion-controlled moneymaker.

PlayStation 3 sales had received a strong boost over past weeks from releases such as Yakuza 3 and Resident Evil 5 in Japan, as well as the Blu-ray release of the movie Final Fantasy VII: Advent Children, which included a playable demo of Final Fantasy XIII.

Nintendo’s DS Lite (whose sales are not included with DSi), Sony’s PS2 and Microsoft’s Xbox 360 rounded out the depressed hardware charts.

(Week of May 11-17)
DSi: 34,152
PSP: 28,683
Wii: 15,116
PS3: 11,605
DS Lite: 4,888
PS2: 4,020
Xbox 360: 3,233

Source