Make:

This would be handy in a sketch book as a time/date stamp. Just wave it accross the paper, and the current time and date (involves some kind of time algoarithim of course) would be printed.

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I really like this idea, but the link doesn't include enough info to build your own. At the very least, you'd have to start reverse engineering the cartridge from scratch.

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I'd like to see an implementation using a wheel on the bottom (or scanner from a modern optical mouse) to get the printing sized correctly. It looks like this version relies on the user moving it at an appropriate speed and direction. This can be a benefit, though, for neat effects.

Argh! Brain storm! What if the thing were mounted in the bottom of an optical mouse, so that it would read the X and Y position and put down dots based on a source image? You could then scribble in a picture. Ooh, ooh, what if the source picture were just a repeating pattern? It would be like some kind of magic Zip-A-Tone brush! You'd only really need one jet, too. The whole thing could be built into something the approximate shape of a chisel-tip marker.

If I didn't have so damned many things already in progress I'd give it a shot.

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It actually exists as a commercial product:
http://www.xyron.com/enUS/Products/Xyron_Design_Runner.html

But in maker spirit I love the idea of building one.

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