>Can you define your needs? Web? Desktop? Tablet? Phone?

I'm a desktop developer. But I think subscription model would be nice with web for future or sell applications at Windows store would be good.

So in first desktop. Maybe future web and/or tablet. Python seem work at Mac OS without any change, I see more MacBook users. It would be good my applications Mac X version. I have a retail sales application and I don't see any commercial applications like this at OS X...

Currenty desktop.

In future web or store (Windows and if possible Apple). I don't ask customers for invoices at future. They pay, they use. Subscription with Web and Windows/Apple store models good for this. But I'm not sure what's the best... Maybe at this time subscription with RDP would be best simple approach. A canadian developer from UT (sory, I can't remember his name) adviced me rent application with RDP.