Second Life is a very different kind of MMO game, not involving raids and dungeon crawls instead relying on interaction as the key.  There are no levels to go up or rare items to find, you make them yourself or trade with someone who does.  Another big difference is the fact that it is free.

It has attracted millions, and a much higher percentage of women than WoW or Everquest.  OCMODSHOP takes a look at second life, and the changing demographics of gamers.
“With the introduction of locations like MySpace, Facebook, YouTube and the amazing variety of horizontal and vertical sites the demographics again shifted. Today 60% of the users are 25 and older. While many of the social networking sites are country-centric, many are going global – reaching, touching and entertaining people who have specific subject and avocation interests.”

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Gaming