I use OpenDNS at home (to filter pr0n from the kid - at least until he wises up and learns about DNS and how to change the name server setting :-), and have enabled the statistics. It is eye-opening how much one can deduce about browsing habits from even rough statistics about the DNS lookups (and also the staggering amount of tracking and advertisement lookups). Something that could be pure gold for advertisers, and also various spooks or other shady characters. I'm keeping an eye on whether OpenDNS keeps its integrity. Any alternatives if it goes sour?