For which platforms in which categories is the software development most perspective?
Obviously, the breaches in the popularity of such categories as « Entertainment », « Games » and « Travel » tell us that after development of software for one platform in one of this categories and its' porting to some other platform (f.e. from Series 60 to P800 ), it will not be so popular, as it was expected to be.
As we see, the outsider of our statistics is « Education & Reference »: there are still few users, that prefer to use their phones for education. Though, having developed a «killer app» for this category, one can hope for success and can raise to the first position of top-rating, because the developer will not have to compete with successful applications.