Sgt_Kickaxe - 6:17 pm on Dec 30, 2010 (gmt 0)
robots.txt will not stop your sites from being discoverable and adsense isn't the only footprint that links them together. Analytics, other 3rd party tracking, other ad network identifiers, your footer copyright link etc..etc. the list is LONG of ways to connect the dot coms.
A+ to Blekko for giving it a shot but I don't suspect it will attract the sort they want.