I have heard from some reliable sources that Microsoft is quite happy to pay for design+development of applications that are built for their new devices (wp7/8)

I have heard from some reliable sources that Microsoft is quite happy to pay for design+development of applications that are built for their new devices (wp7/8). Perhaps you could reach out to them and see if they would acquire your work. It's not the best free market alternative, but it might get your product to live and prosper. Imagine, if Sparrow (Microsoft eMail Light) gets included in every new tablet? Sure, they've got Outlook, but maybe users would dig a lighter (simpler) new alternative?