dstiles - 10:24 pm on Jun 24, 2010 (gmt 0)
It's a bot. I ran through my "trap" logs this evening and found nine confirm404 hits since 19th June, all from the same IP - one that has a proper crawl rDNS. The same IP actually hit 103 times in all during that period but the other hits were for genuine pages as far as I can tell (haven't checked all of them).
Because of the way my traps work the bot was effectively suspended from accessing any data after the first confirm404 hit, being fed a 403 instead. Still, slurp visits far too frequently anyway. :)