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Forkbeard - 5:03 am on Jan 19, 2005 (gmt 0)
Of course, I wouldn't expect the search engines to lose sleep over this "unintended" consequence.
If you trade many reciprocal links, though, this gives your link trading partners a new way to cheat you, and adds a fairly complex additional step to the process of checking whether any given link partner has left your link up in honest fashion.