EMEAA Software Totals
I think it's somehow strange, that the DS & PS3, which sell the most hardware, don't sell the most software ...
Not really. It's all about what SW is releasing that week for which system. So, while the DS and PS3 have strong baseline demand - i.e people just deciding to get the HW and maybe some of the more popular titles - in a quiet week in terms of new releases they'll see weaker software sales.
It happens to all the platforms it just depends when you look. So when, say, Monster Hunter releases on PSP in Japan for that week the handheld shows crazy SW sales. This week Fable 3 is boosting 360 SW sales for example.
You need to really look at which platforms are getting SW driving titles launching and whether they are exclusive or not, after which it all becomes obvious.
For example, when GT5 releases it's a sure thing PS3 SW will spike. Earlier this year we saw Reach spike 360.
Also, handhelds, apart from certain titles, tend to show less front loaded sales on titles and due to a typically broader ownership demographic sales tend to spread over more titles. That's the norm anyway for handhelds vs consoles although it can vary by title a bit.
Try to be reasonable... its easier than you think...