Ever needed to share a bunch of files with a group of people but didn't feel like carrying on your laptop to do it? Over on Node, Chris Robinson put together a guide for building a tiny file-sharing beacon that shares anything you put onto its micro SD card.
The box here is about the size of a box of Tic-Tacs, and it includes a micro SD Wi-Fi adaptor that shares the files. The whole thing is powered by a rechargeable battery, and it can be put together with just a bit of soldering. Once you're done, just drop in a micro SD card with the files you want to share, and it will immediately broadcast to up to five people.