Wii - 78.5 Million
360 - 40 million
PS3 - Really hard. I don't know whether to believe that Sony will price cut this year, or won't. And what regions. But I'll go with they will since I'm an optimist, so 32.5 million
DS - 124 million
PSP - May or may not be a new PSP next year, so, I'll go 54.5 million