Arduino and Gameduino hardware, add a splash of PLAN-13 satellite tracking software from 1983, and finish with a healthy dose of libertarianism. The result? A neat little hack called Angst, designed and built by Mark VandeWettering (aka Brainwagon). It can store details of up to 750 satellites on 128KB of EEPROM memory and display their predicted orbits in all the glory of SVGA. Don't get lazy though -- the most reliable way to track those pesky snoops in the sky is still to don your anorak, step outdoors and snoop right back.