Ack, this was sitting in my drafts folder for nearly a year. At the time I started it, someone had asked about how one might use Croquet virtual worlds to subsume other technical functions in the same way that the World Wide Web has incorporated other resources and functions. I did five minutes on the taxonomy of the problem-space.
I should have just answered with this video of Intel’s John David Miller demoing the use of Twitter from within a Qwaq Forum. He fills in the stuff on the Twitter Web page (crappy hand-held video, below) and then I love how the audience guy asks, “And then you can bring the result in to the world?” JDM answers that it already is, and dollies back to show that the whole interaction has been in world the whole time.
Reminds me of this from way back when.