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Is there any means of retrieving the current pixel coordinates within an image where the mouse cursor is?

(Failing this, are there any stock OS X tools that can easily do this?)

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Not that I know of. The closest stock solution I personally use is to take activate the utility to take a screenshot of a screen portion (Command ⌘+Shift ⇧+4). The cursor will turn into a crosshair with the screen's horizontal and vertical pixel coordinates. You then have to apply some math to determine the distance between the end-points you want to measure. Not ideal, but better than nothing.

You can also try using xScope, a nice 3rd party utility which makes life a little bit easier with dedicated tools, but it is zoom agnostic, so make sure you measure at 100% zoom.

Photoshop is the only tool that effectively takes pixel distances regardless of the zoom level, but you have to open the image or at least a screenshot (if you take it from a website or PDF) in Photoshop.

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I generally use Gimp for this task, although it is indeed also ill-suited for making a quick one-off calculation. –  noffle Sep 24 '12 at 22:23
    
While in the crosshair-selection mode, while the mouse is moving, the coordinates are the size of the screenshot. For a second or so after the mouse pauses, the coordinates show the location on the screen of the crosshair. To get the coordinates in a window or image, start the selection box at the upper-left of the window or image. –  CajunLuke Sep 26 '12 at 2:39
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