Activity Streams is an upcoming format to describe and syndicate activity on the open web.
The basic idea is to standardize the way you express an activity online: someone did something, or "John posted a photo". The format is getting richer by the week and aims to become a standard. It's already used by Facebook, Google, MySpace, Windows Live, Six Apart and others, and is enjoying growing attention and adoption.
My presentation will start by quickly presenting Activity Streams to enter a discussion of their potential for revolutionizing personal and organizational information systems as a format that provides super simple universal object descriptions. The discussion will be illustrated with tangible and futuristic (surreal?) use cases.