Raph Koster rolls out with a new ......game...errr platform...err well heck let him just explain it:

[URL=http://www.metaplace.com/]Metaplace[/URL]

"Metaplace is a next-generation virtual worlds platform designed to work the way the Web does. Instead of giant custom clients and huge downloads, Metaplace lets you play the same game on any platform that reads our open client standard. We supply a suite of tools so you can make worlds, and we host servers for you so that anyone can connect and play. And the client could be anywhere on the Web."

Here is [url=http://www.youtube.com/watch?v=tZiB_JcRH_s]Raph[/url] on YouTube explaining it.