Piotr Dachtera took his 64pola.pl, and created a scalable version using Comet. Dylan reports it as “a Jetty-powered Comet app that uses dojox.cometd on the client-side. It’s a solid implementation that shows chess moves in real-time, and to date is the best all-around Comet game I’ve seen that is live to the world.”
Mathieu Nouzareth then commented that Cafe.com, a Flash based gaming platform also uses Jetty and Comet techniques (compared to AMF etc).