Hi,
I was just reading up on Errai and it sounds quite interesting.
I noticed that your implementing Comet using long polling. My project
gwt-comet
http://code.google.com/p/gwt-comet/ implements Comet by
streaming messages over long lived HTTP requests to minimise latency and
bandwidth requirements and maximise the throughput.
It also supports GWT serialization of messages.
I know you probably are working on many other aspects of ErraiBus but
may I suggest using gwt-comet for your underlying Comet transport?
From Richard.