Space Imaging, a commercial venture selling satellite photographs of the earth, has a photograph of The Gates as seen from space. (The Ikonos goes down to 1 meter — which scares the shit out of DOD to the point that there are restrictions on what Ikonos can photograph — but this looks like it was shot at something higher, maybe two.)
You can also access the image from their main page through a Flash interface, with pan and zoom, but this is very cumbersome and it doesn't give any more detail than the direct link with a decent photo viewer. The photo above is excerpted from the huge image of the entire park. This is the aerial companion shot to the one I took across the lawn.