As for the iPhone vs Android thing, the graph used by OP is a bit misleading (it's restricted to AUS only). I'd take a look at these ones instead: http://gs.statcounter.com/#mobile_browser-ww-monthly-201108-... or http://gs.statcounter.com/#mobile_os-ww-monthly-201108-20120... for worldwide.
I guess he's trying to highlight how it's different in different places around the world though.