Pack external files - with photoshop files? Ok I know you can pack external images into your blend by packing external data, but I this doesnt really work with photoshop files. 

I have several images as planes that link back to .ai files that are placed into photoshop files, and these are fed into blender. Packing them results in gray images - what's the easiest way to pack files so I can send the blend to another computer?
a bit late, but I think the best solution is to save those PSDs as TIFFs.
TIFF is apparently supported by Blender for Packing. And you can still place your .ai files in a TIFF file.
I am having the same issue right now, and all PSDs were't packed and appeared pink.
But all TIFFs are still there. So I think that should be a good workaround I think.