A lot of work got done on a lot of great projects at last weekend's Random Hacks of Kindness; one of the most exciting was the Hermes Message Carrier, an ad hoc store-and-forward way to get messages out of areas that have gone dark after disasters by swapping them between mobile devices until one of those devices gets back into the light. This video by Julia Stowell has a good succinct explanation of its ideas and purpose—it's very cool stuff.