Like Aardman's WebbliWorld, KnowledgeAdventure's JumpStartWorld doesn't yet have a multi-user component, but it is an educational online service for kids that lets them explore a "3D Theme Park" with mission-based rewards.

One key feature about JumpStartWorld is the opportunity for parental engagement. From the press release:

One of JumpStart World's distinguishing qualities is the opportunity for parent participation. Moms and Dads can send their child photos and other forms of encouragement that appear in the world as the child plays, allowing parents to stay connected, even on the road.

So, not a "world" per se, but an interactive environment for kids with an online component that demonstrates the way this kind of technology can be leveraged to create connected participatory experiences that extend beyond the familiar "web-portal-with-minigames" interface. The website features avatars that "grow" with the child, getting taller (and hipper) looking at each grade level, and promising "personalized learning that responds to your child's pace" and "new play experiences every time your child signs on."

JumpStartWorld is available either in a retail box or via download, both at a cost of $19.99.

[Via Virtual Worlds Forum Blog]