Early October I was in Brussels attendeding a workshop of the Knowledge Management for Development Network (KM4Dev.org), the leading Community of Practice on KM issues in development.
In one of the sessions there were several people with Twitter accounts persent, and we started twittering during the sessions with out laptops. It was really interesting to do this during a normal face-to-face session when one person was presenting and others in the room where adding context and opinions while the resource person spoke. This side communication (a bit like whispering in the classroom, but less disruptive) made the session very rich and added a lot of different perspectives. At one point we even exchanged comments across different sessions which took place in different rooms of the building at the same time. This created a connection and some information flow between events which otherwise would not have been possible.
Then in the afternoon we scheduled a discussion session to be held in Twitter (marked with a particular #tag so people can find contributions easily), and announced it to other KM colleagues all over the world who couldn't attend the workshop. And even though the announcement was on short notice, we had several external people who were engaging into the live discussion, which really opened up the face-to-face event to a virtual audience.
This was definitely an interesting good practice on how a status update feature can add value to live events, and something which could be easily replicated in any corporate system where a status update feature is included.