Our image web pages all have this great map feature (click the image to the right for an example). (It’s been there for a while, so you may have noticed it already.) If you scroll down to the bottom, below the Observation Toolbox, you’ll see a mini context map from Google maps for the specific image whose page you’re viewing. It’s so useful to be able to see the HiRISE footprints placed on a broader view of Mars, showing the surrounding geology. Plus, you can pan and zoom around in the map. Way cool.
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To give you some idea as to the size of a HiRISE image, I’ve put together a few screenshots from our planning software, HiPlan. These images compare the HiRISE footprint with that of the the THEMIS instrument aboard Mars Odyssey. These screenshots are shown below as thumbnails; click on a thumbnail to see the screenshot at its actual resolution.

I should note that these are not planned to be actual HiRISE images; I was using HiPlan in test mode while working on the display of the individual HiRISE CCD footprints.

Take a look at this screenshot. It covers a small region of Mars roughly one degree across and slightly less than a degree tall:

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