Here's my first world I created in Metaplace that I can now embed here (or anywhere on the web)! This is a pretty revolutionary way to move virtual worlds from "walled gardens" to places situated in the wider social web. Embedding can increase traffic to your world, let you more easily hang out with friends, or even host your own web-based virtual concerts, like Grace McDunnough has been doing in her Live Music Lounge.
I stopped in at Grace's place tonight and found 40+ avatars hanging out and listening to her play live (pic)!
You can read more about embedded virtual worlds on the Metaplace site.