The World Stock Exchange was build by an australian company and offers virtual companies to raise capital
watch it at: http://www.wselive.com/
Source and further explanation:
http://www.digitalmoneyworld.com/welcome-to-the-world-stock-exchange-virtual/
WSE is also one of the more controversial stock exchanges within Second Life:
I’ve been covering it (and other exchanges) for some time:
http://www.your2ndplace.com/taxonomy/term/95