phranque - 10:31 pm on Aug 24, 2012 (gmt 0)

i believe most well-behaved robots will use the exclusion that is most specific to the user agent and if there is more than one relevant exclusion the bot will use the most restrictive.

i would assume in general that means "noindex, nofollow" for bots that support X-Robots-Tag.

however googlebot should see the more specific "googlebot" exclusion and go with "index, follow"