Googlebot using open proxies? Somehow, I doubt it. An interesting snippet from the access logs again. (Some details rewritten to avoid boosting PageRank.)
220.73.165.14 - - [25/Jul/2003:04:42:14 +0100] "GET /someurl/foo HTTP/1.0" 2147483647 0 "http://www dot gay-sex-men dot net/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)" 220.73.165.14 - - [25/Jul/2003:09:04:17 +0100] "GET /someurl/foo HTTP/1.0" 2147483647 0 "http://www dot gay-sex-men dot net/" "Mozilla/4.0 (compatible; MSIE 5.0; Windows 98; DigExt)" 220.73.165.14 - - [25/Jul/2003:09:15:28 +0100] "GET /someurl/foo HTTP/1.0" 2147483647 0 "http://www dot baitbus dot ws/" "Mozilla/4.0 (compatible; MSIE 5.0; Windows 98; DigExt)" 220.73.165.14 - - [25/Jul/2003:09:18:11 +0100] "GET /robots.txt HTTP/1.0" 200 130 "-" "GoogleBot" 220.73.165.14 - - [25/Jul/2003:09:27:57 +0100] "GET /someurl/foo HTTP/1.0" 2147483647 0 "http://www dot blowjobs-cumshots dot net/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)" 220.73.165.14 - - [25/Jul/2003:13:18:04 +0100] "GET /someurl/foo HTTP/1.0" 2147483647 0 "http://www dot hot-legs dot info/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; Win 9x 4.90)"