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Financial Times on the value of leadership training in SL, using the MIT Sloan Leadership Model: http://www.ft.com/cms/s/0/2f81e8e4-e8c4-11dc-913a-0000779fd2ac.html?nclick_check=1
For people with older/slower computers, the Dazzle Second Life viewer may allow you to use SL effectively: http://wiki.secondlife.com/wiki/Dazzle