This may or may not be related to the
MSN Cloaked Bots [webmasterworld.com] thread, in terms of recent requests for non-existing logfiles.
I saw this pattern for various sites:
http://www.example.com/estadisticas/usage_201007.html
http://www.example.com/statistiche/usage_201007.html
http://www.example.com/logs/usage_201007.html
http://www.example.com/statistik/usage_201007.html
http://www.example.com/stats/usage_201007.html
http://www.example.com/webalizer/usage_201007.html
http://www.example.com/webstat/usage_201007.html
http://www.example.com/webstats/usage_201007.html
http://www.example.com/usage/usage_201007.html
"GET /estadisticas/usage_201007.html HTTP/1.1" 404 123 "http://www.whoisde.de" "Mozilla/5.0 (compatible; [
whoisde.de...] +http://www.whoisde.de)"
Originating from: 193.201.54.nnn
193.201.52.0/22 (FirstDedicated Data Communications AG)