A lot of interesting products and services have been demoed at Google I/O 2011, including a number of interesting features for Ice Cream Sandwich, Android's forthcoming iteration. One of the less flashier features demoed is the 0-click peer-to-peer NFC sharing. This allows compatible Android devices to share content (contacts, links, YouTube videos) between the devices by simply placing them in close proximity to each other. No app needs to be run and no buttons need to be clicked - hence the "0-click" moniker.
Sharing data between devices in this manner is not a completely novel concept as the cross-platform app Bump already provides similar features.