It's probably best not to nit pick about the photo. As people said earlier, ones that have been called fake before turned out to be genuine. However I can't help myself...
I own a digital camera and I often find artifacts around edges (down to the jpeg compression) and ghosting/fuzzyness around edges.
The 3 hanging boards do look in the right perspective. They are hanging straight (compare them to the pillars) Any slight un-eveness could be caused by the strings not being adjusted correctly on either side. Also cameras (especially cheap and digital ones) can distort perspective slightly.
Looking at the large image, the strings do not appear to continue down underneath the left board. It looks like underneath is a shadow. The reason it doesn't match the shadow above the board is unknown, but is consitant because the shadows to the right of the pillar do not run parrallel either (sorry if that doesn't compute easily its pretty late here heh)
The only real 'evidence' I can see suggesting this is a fake is the fact that the circle containing the Apple logo matches the circle in the left test card. But this could easily be co-incidence or designed to match. The gradiant on the apple board looks to me to be at a different angle to the gradiant on the test board and again fits the perspective well.
If this is genuine it doesn't mean that Marklar is coming or Apple will start using Pentium CPU's, it just means someone from Apple will likely have been talking (we're lead to believe Steve Jobs) what about - we don't know.
If its fake then congratulations to the artist. It's been fun
