Mark, thanks for raising these questions, we at Last.FM are facing the same issues as Yahoo! is wrt squid-2/-3.
In answer to your final question in the list, I've tested -3 on a number of servers over a number of time-periods during the past few months. Unfortunately, the missing features found within -2, combined with sluggish overall response times and higher server load make it impossible for me to move over to it for our production squid cluster. -Tony -- Tony Dodd, Systems Administrator Last.fm | http://www.last.fm Karen House 1-11 Baches Street London N1 6DL check out my music taste at: http://www.last.fm/user/hawkeviper
