InterFUEL, which has created virtual worlds and interactive online content for the likes of Shining Stars, Nickelodeon, MTV and Sesame Street, has released a new report identifying and detailing seven features it says are must-haves for virtual worlds targeted at kids.

InterFUEL estimates that about 1 in 4 of about 35 million online kids in the US go to virtual worlds "often," citing eMarketer stats that anticipate the number will be 1 in 3 by 2008 and 1 in 2 by 2008. The company's goal in creating the report is to help marketers who want to tap this market

So what are the seven key features, according to InterFUEL?

-Mom's approval, since the ultimate decision to admit a child rests with the parents.
-Safety, under the law, and in the eyes of parents and children.
-Fun, fun, fun!
-Fresh content, so that visiting the world becomes part of a child's routine.
-Ways to connect and socialize with other kids.
-A feeling of control over the child's appearance, personal space, and resources.
-Means to encourage self-expression.

"Fun, fun, fun!" Seems a bit obvious, doesn't it? The full report apparently details the key features in-depth, but I wonder if they've got "fun" for kids down to a formula so easily!