No clue. Many bots seem to visit the site though.
Code:
TurnitinBot [Bot] 07 Jul 2010 02:13 pm
Yahoo [Bot] 07 Jul 2010 01:57 pm
Google [Bot] 07 Jul 2010 12:05 pm
MSN [Bot] 06 Jul 2010 08:08 pm
Ask Jeeves [Bot] 06 Jul 2010 01:38 am
Majestic-12 [Bot] 19 Jun 2010 05:46 pm
Exabot [Bot] 16 Jun 2010 07:12 am
MSNbot Media 28 May 2010 05:17 pm
Baidu [Spider] 19 May 2010 05:42 am
Alexa [Bot] 24 Jan 2010 11:33 pm
Google Feedfetcher 12 Jan 2010 11:39 pm
psbot [Picsearch] 21 Aug 2009 04:42 am
Google Desktop 23 Jun 2009 12:30 pm
Gigabot [Bot] 23 Jun 2009 12:10 pm
W3C [Validator] 02 Dec 2008 10:43 am
Google Adsense [Bot] 30 Jul 2008 09:35 am
WiseNut [Bot] 25 May 2008 07:11 am
Probably the case they are all pretty dumb and just search every server address they can resolve. I imagine the magic that makes search engines useful is how that information is processed from such a raw form into coherent search results.