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One click to download, two double-clicks (one for the gzip, one for the PS) to open on my Mac.

I can automate it for you... :)

I wasn't complaining that this was particularly onerous (in fact, I am always pleased how easily PostScript files open on Macs)!

On my Mac it opens directly in preview, after I clicked the link in Safari. I have not done anything for that functionality, so I'm pleased.