Another idea :

Not only the possibility to check paid/free version using internal SDK
API, but also an API which enable the application to know 'how much'
of the application has been bought.

An example :
I made a text to speech application.  Each voice (language) can have a
price, and my application could unlock languages if the user paid.

The same example can be used in games :
level 0 to 5 --> free
level 6 to 20 --> $1
level 21 to 40 --> $1 more
1 item for the role game user can be sold also.

Other kind of applications could be sold in several parts : social app
(pay to have full desc. of 10 people and have the right to contact
them), translation app (pay for new language), ...
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