Could see more usecase in something like yammer/hipchat/hall where you have your work-related contacts in place already w/o the social noise. Cool out-of-the-box usage for twitter though nonetheless!
Wow, I really like this idea. It's a different way of using the technology, and the features of Twitter could actually make it quite easy to get into that workflow.
We're building a web app that is very close to this workflow. Main principal is you can share tasks from your (private) todo list to the team (public) todo list. Team members can see available tasks and pick them up when free. Our tag line is "We make teamwork visible"
We'd love to have anyone interested sign up and we'll give early Beta access in January.