Business 2.0 have a fascinating article on domainers, and the best (up until recently least) well-know domainer of them all, Kevin Ham:

"The man who owns the Internet" - http://money.cnn.com/magazines/business2/business2_archive/2007/06/01/100050989/index.htm

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Updated 2021 : note that the above post is out of date as it was originally published in 2007, but is left here for archival purposes. Unfortunately the external link is now dead, so I have unlinked in.