Often, a majority of the reported "guests" are actually Search Engine Spiders crawling the forum to index the posts. You can expect this number to be large while the entire board gets re-indexed. This kind of thing will recur monthly. On one forum I ran I had to block several spiders because they were so aggressive that they slowed down performance of the server. Slurp (the Yahoo spider) was about the most aggressive.
Regards,
Matt
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Planning our next Escape!
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