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Hi,
The windows are always going to be the coldest part of the wall, because they cannot be as well insulated as the wall itself. So, the air inside the window will always be chilled (relative to the average air temp in the room) and so the natural air motion will always be there. Sure, it's not as extreme with a good, tight window -- but it would probably be less efficient to move the radiator somewhere else in the room.
I help design buildings for a living, and the laws of physics and thermodynamics have not changed. The best place for a conventional radiator is under the coldest part of the exterior wall.
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