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I think you can actually do that now. Although I believe it syncs everything you buy/get from any device. So it's not as selective where you can just press 'Download' and it goes to the device you choose.

This might help iphone users: http://teleapp.me/

you can do that with itunes

And with Windows Phone.

But that defeats the point - the point is that it's nice to be able to just click "install" from a browser page, and it ends up on my phone.