rogerd - 1:55 am on Feb 28, 2012 (gmt 0)
I got through to the Google Groups link, and did a little more research. It seems possible that this activity is generated by the Gomez Peer Zone, a sort of voluntary, paid botnet operated by Compuware. It can be used for load testing purposes, as the firm offers that service as well as monitoring. No hard info yet, but the Gomez thing is, in fact, Windows only.