Everything was done 100% in photoshop except for the circuit board overlay on the eye.
Yet everything else was photoshop. No special brushes either. Most is simply using custom gradients on an otherwise plain white shape.
The grundge effect was done by a gradient overlay with some noise, and a couple of tan colors.
Here's another version thumbnailed with more details, 1 special brush (radiation symbol).
I call it the I-Blade... Might find a way to integrate it into my website to spruce things up.
The saw part was the biggest pain. Basically I used the lasso to grab the shape, and fill it with white. Then I copied it, rotated it 20 degree's and placed it by hand over and over again untill they went all the way around. Dropped them all down to a single layer, and applied a gradient.