As a part-time app developer, I've released a handful of open-source apps to the Maemo Extras repository. But recently, I've been expanding my efforts to other operating systems, and toying with the idea of releasing some commercial, closed-source apps.

While I am fine with the idea of releasing apps open-source, there are just some situations where you cannot operate an app for free. (Case in point, there are no free sources of weather data, so to create a weather app you need to pay someone a regular, ongoing fee.) So, are there any methods left in the Maemo world for distributing an app that requires some form of payment?