Photos of WTC Lights
They are not, as popularly believed, at Ground Zero, but rather a nearby parking garage rooftop. They are also not a single beam but rather many smaller beams that coalesce in the sky and look like one solid ray from a distance.
These first two are from an amateur photographer I met on the roof.
And a couple from my shoddy point-and-shoot digital, which has twice been dropped in vats of liquid (one time a stream, the other time a bathtub of watery beer, or beer-y water, take your pick)