This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
I'm using GWT with tomcat 6 and 7. I've tried writing a filter to forward things if the requested content + ".gz" exists. That works, except for the fact that the requestDispatcher will commit the request and set the content type to application/x-gzip