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22.214.171.124 - - [13/Jul/2004:05:13:10 -0400] "GET / HTTP/1.0" 200 37577 "-" "Googlebot/2.1 (+http://www.googlebot.com/bot.html)"
126.96.36.199 - - [14/Jul/2004:01:27:14 -0400] "GET / HTTP/1.0" 403 670 "-" "Googlebot/2.1 (+http://www.google.com/bot.html)"
Since it's a non-profit info site only, this is no big deal. But of course I fixed the problem by allowing the new user-agent. Googlebot came back the next day, and the site didn't suffer in the SERPs at all.
Additionally, the site *is* cloaked in that it returns a shortened, "prettier" title to search engines that do stemming for plurals like Google does. Still -- no ill effects from this situation.
Maybe this *is* old news, but I didn't see any other posts on it.