NerdKits - DIY Marquee LED Array Display
http://www.nerdkits.com/videos/ledarray2/

double your addressable LEDs

science

DIY Grow Lights | Popular Science

We took to the hills of Wales armed to the teeth with sheep, LEDs and a camera, to create a huge amazing LED display. Of sorts.

A replacement for the black and white stripes of the traditional barcode is outlined by US researchers.

http://news.bbc.co.uk/2/hi/technology/8170027.stm

A replacement for the black and white stripes of the traditional barcode has been outlined by US researchers. Bokodes, as they are known, can hold thousands of times more information than their striped cousins and can be read by a standard mobile phone camera.

bocode project from MIT media lab. small code visible to cameras, but not human eye. Different info from different directions.