[Jon] noted that this guy is using his Prius as backup UPS for his house. [It's been around, but's it's worthy.]
If you’re having issues with Eagle for the contest, [weirdguy] suggests this tutorial.
[Michael] added an aux ‘input’ to his car stereo in a unique fashion – he wired it directly to the car speakers and drives them from his iPod. [I'm not recommending this, but it's certainly a different approach.]
Finally, [oliverjenks] sent in this table saw finger jig hack – using some random power transistors, light bulbs and a laptop to drive a stepper motor.
If you haven’t already, check out our Design Challenge contest. I finally got some fedex shipping notifications today, so I should be able to officially announce more prizes very soon.