Metaplace: open DIY virtual worlds for everyone. Finally we know what Areae, Raph Koster's company, has been working on. It sounds very much like what Brian Moriarty envisioned in his Listen! speech at the GDC in 1997.

(Via Boing Boing.)

Update: Alice has a lot more information, as she should since she is way more focused on this subject than I am.