I love this satire of the ever-popular Second Life, it pretty much sums up my feelings on the subject perfectly:

Get a First Life : http://www.getafirstlife.com/

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Updated 2021 : note that the above post is out-of-date, given this post was originally published in 2007, but is left here for archival purposes. I have unlinked the original external link as a new project is hosted there now. To read about the original "Get a First Life" project, see the original 2007 blog post from it's creator here: https://darrenbarefoot.com/2007/01/20/my-project-du-jour-getafirstlifecom/