As far as this sold to retailers/sold to consumers BS line that some people try to spew, put it this way, at the end of the day, the end of the generation, sold to retail = sold to consumers or very very close to it, so I don't care.
I'm sorry man but I can't honestly have a debate with you since you believe ioi's numbers are right and Sony's is wrong LMAO.

EDIT: As far as your discrepancy goes, I didn't double check but even if that happens it has to do with the fact that SCE changed the way they display it from units being manufactured and in their warehouses to units actually sold. We have 50 million sell in units as of January 31st 2009 according to the official release from Sony and that's all that matters. Like I said though you can believe whatever you want, I don't care, but I just cannot get in a real debate with you though, but I gotta give it to you, I never thought I would see someone argue that vgc is right and official manufacturer's numbers is wrong lol

ioi's are right in terms of sold to consumers.

Sony's are confusing as they is a 1m contradiction in totals and even that range is for sold to retail.

So, no I'm not suggesting ioi is right in terms of shipped, only in terms of sold to consumers.

lets see PSP came out in 2005 its at 48.5 million now. about 10 million a year since it came out. PSP go coming out this year should extend its lifespan just like the DSi will. nither nintendo or sony really want to launch another new handheld anytime soon, so unless microsoft releases a handheld of epic porportions we won't see another for 4-5 years. I think nintendo and sony would rather just add more power to newer models keeping BC with current games.

PSP+PSPGo will reach 100 million

DS+DSi will reach 200 million

What? Look at how the DS has sold and know that it only recently passed 100m sold, and is an older platform than the PSP. Also note that the PSP's really only relevant in Japan, America just hasn't really been too interested in it.

65-70m seems like a reasonable prediction, and you can't call it anything other than a success. But it is not a DS sales monster, and I don't think PSP Go will do much to change this fact.

I will say no based on the fact I believe a PSP"2" will release before it has the chance. If Sony surprises me and decides to keep it alive for a much longer time, there is a possibility.

ioi numbers are a tracked estimate that is very close to offical numbers. they aren't to be taken as the final numbers the recent adjustments is evidence of that.

Only when the DS will reach 250M...

More like 200 million if we go by PSP to DS sales rates

More like 220 million if we go by PSP to DS market share. But anyway that won't happen.

With all those games coming out it can have a boost the next years. It sold 40 million when people were saying it has no games...It will sell less the next years when it has games?