Hmm
"i really want to see a graph that shows the average of iphone 4 sales compared to each individual android phones launched within the last 6 months."
It would be an interesting graph but it wouldn't tell you anything you probably can't guess for yourself. i.e. that some android phones like the Desire, Galaxy are more popular than others and that as an aggregate sales of all models are taking off big time. You can't see per model stats (though Google probably know them) but you can monitor % market share of various android versions here (http://developer.android.com/resources/dashboard/platform-versions.html). Takeup of 2.1 has been huge in the last few months.
"yes, indeed. android users are on the rise. this is mainly because its more widely available compared to iphones. technical or other issues only have little influence these sales. price and availability has got more to do with it."
I suspect you're right, but at the same time android delivers a comparable experience to the iPhone for less money. A lot less money in some cases depending on model and tariffs. People are starting to realise they can have an excellent phone which suits their needs and budget without paying an Apple premium on top. I expect the same will probably happen with tablet devices too when a bunch of cheaper Android / Windows 7 models start appearing with similar functionality to challenge the iPad.