Well it looks like it was a rough month for consoles last month. With 4 of the 6 consoles going down in sales why should it not. I have written both may U.S. sales and april sales so you can compare.
May:Wii: 289,500 Xbox 360: 175,000 Ds: 633,500 Ps3: 131,000 Ps2: 117,000 Psp- 100,400
April:Ds: 1,040,000 Wii: 340,000 Xbox 360: 175,000 Ps3- 127,000 Ps2- 172,000 Psp- 116,000
Hopefully we will see a better month in june. but atleast nintendo is the remaing champion.