IOS fragmentation - distribution amongst different devices

Hi, has anybody figures concerning the fragmentation (distribution) of IOS Versions amongst Iphone, Ipad, Ipod?

Thanks for any answer!

According to this article from January 2011:

By major revision, the statistics are as follows:

4.X: 89.73 %
3.X: 10.25 %
2.X: 0.02 %

Since this was pre-iOS 5 release (by a long shot), you’d have to figure for that. I’d wager that the uptake would be significant, though. I’d imagine the only iOS users stalled at old versions are jailbreakers and those with legacy devices (i.e. Original iPhone and iPhone 3G users)

Thanks a lot! It seems reasonable that
jailbreakers and legacy users do not amount -apart from piracy- to significant numbers.
So I think going with 4.x should be fine. Thanks again.