I've checked in some changes to bring cargo more up to date with the jetty6 API.
I have not yet been able to test these, so if David or someone else has some time, that would be great.
There is still some more work that could be done. The javabeans properties that are set up on the Jetty6xLocalDeployer should be moved instead into a Jetty6xWAR class to allow the user to supply custom configuration params for the war at deploytime. If there are any questions please ping me.