Your processed images make the originals look downright cheerful! Like everyone else, I love the partial desaturation, and these look gritty to me. I don't know any particalar post processing tricks for urban industrial photography, but from what I've seen of others' work, you're on the right track. Maybe there are no tricks, maybe it's just all personal perspective, and developing an eye for it? I've known some urban photographers to sharpen their images more.
My only specific critiques are for 5a, I would crop out the vehicle. For me, a late model car saps the timelessness out of any shot. Though perhaps your intention was to accentuate the contrast between the old and the new, and in that case it works. It's a beautiful shot, but the car thing is one of my pet peeves.
In number 6a, if you have cs2, try running it through Filter-Distort-Lens correction. A big problem with urban photography is the distortion that comes from photographing tall buildings. Some people like it, and in some cases I think it works, but in this instance, I find it a litte extreme.
This is a stunning set. Bleak and haunting. I love urban ruin and industrial photography.
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(there, I've invented a term). 
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