Weird about the tab thing. I use Linux and have it setup so that the middle mouse-click will open a new tab, and it worked in Firefox, Konqueror and Opera (opening the image in a separate tab, opening nothing in the main window), so it didn't occur to me that others might handle it differently. But that's certainly good to know and a consideration. I mean, I don't want to inconvenience users after all.

I loathe the weird things that prevent saving images as well, because they are such a pointless hassle, and I'm not against others saving my stuff anyway.

The only thing that caused me trouble was that the Firefox image resizing extension sometimes resized the image with distortions inside the javascript overlay.