It's my (second) Life
Have you ever checked out Second Life? It's a virtual world with it's own economy that allows you to buy and sell virtual goods and services, land and more. Also, as an incentive, Second Life also rewards developers who create places where people like to go and hang out.
You can use currency conversion sites to convert US$ to Linden$ (Second Life currency) or vice versa.
There are even people who make a living in our real world by having a business in a virtual world... by having a virtual job.
Its fun to reflect on how far we've come and imagine how far we will go. Will there be a day when virtual stock indexes (say the Second Life Small Cap Index) will be joined along side the S&P, Dow Jones and Nasdaq for real life investers?
Is Second Life the next big place to advertise real world products?