Just found a group of half a dozen or so hits from IP 61.49.40.nn, a Chinese broadband (I think) IP but with three open ports, including 80, 22 and 8080.
The hits were actually from a proxy at 8.8.8.n (guess the fourth number!) using the Chinese IP as a (presumably) open proxy.
All hits bar one were to guestbook pages (and rejected), which suggests a form-spamming attack.
18.104.22.168 - 22.214.171.124 is a level3 sub-range assigned to google with rDNS of google-public-dns-a.google.com. This suggests it may be a public DNS service, but if so why is it behaving like a scraper? And if it is a public general-purpose IP why is it allowed to do this? (Although given G's parctices it would not be surprising.)
Come to think of it, the IP (all 8's) was suggested to me by my broadband provider recently as a way of proving whether I had an external DNS problem or not...