Page is a not externally linkable
-- Google SEO News and Discussion
---- Google Webmaster Tools now shows you where your 404 errors come from!
Receptional_Andy - 9:41 am on Oct 14, 2008 (gmt 0)Thread source:: http://www.webmasterworld.com/google/3765206.htm
Yeh - it implies that Googlebot will add stuff like "/example" to the crawl list - even without a href or obvious URL.
Brought to you by WebmasterWorld: http://www.webmasterworld.com