Have you ever heard about other people online game have great potential in the future markets, or you may doubt about it a few years before. But now you may have to change your mind, especially after you see the following example in "Second Life":

"Second Life" is a completely open-ended virtual world in which members can create nearly anything they can imagine and have the 3D modeling skills to build. Anything they create in-world can be sold, often for significant amounts of money.

The company said there are more than ?18 million worth of virtual "Second Life" goods sold each year.

Currently, Rosedale said, "Second Life" has 45,000 members and is growing at about 10 percent a month. There are now more than 16,000 acres of owned land in the virtual world, and new land sells for about ?129. Users must pay a fee of about ?25 a month to maintain their land. Thus, Linden Lab is earning about ?400,000 a month without ever factoring in membership fees.

--------Originally from CNET News.com