mark_roach - 12:36 pm on Oct 13, 2009 (gmt 0)

The source code feature, "Fetch as Googlebot", does not force a new spidering but retrieves the result of the last spidering - including the HTTP server headers as well as the HTML source

However it appears that Googlebot will immediately spider pages it has not visited before. It will be interesting to see how soon these new pages get added to the index.