I installed privoxy as a transparent proxy on a gateway machine, and I have Sonic for an ISP. I'm seeing a lot of requests to http://updateservice.sonic.com/Ping.asp when I'm browsing random pages.
Does anybody know what that's about?
I have an unconfirmed guess that this is some sort of Microsoft CDN solution so they don't have to have a server cluster somewhere with a few Gbps of bandwidth to answer update queries every 10 minutes for every computer on the planet.