A large percentage of these domains don't even have working Web sites attached to them. So why do people bother to register them? Besides whimsy, Mr. Forbes credits a lingering spirit of bubble-era speculation -- however improbable it may be.

"Someone out there," he said, "is still hoping that someone will come along and form a corporation called uuuuuuuuuuuuuuuuuuuuu.com, and when that happens, they will be sitting on a gold mine and will reap the rewards."

From: http://online.wsj.com/public/article/SB115326960876810574-FoU8a_QP2JGrzoXiutTfnsNcg3c_20070719.html

Quite an interesting piece, actually.