I am presenting tomorrow (Friday, May 30) at RailsConf 2008, a session entitled Rails powered by Glassfish and jMaki. Originally, this was intended to be presented by my colleague Arun Gupta, but his wife is due with a child "any day now", and she, for SOME reason, took exception to his being away right at the moment :-).
Best wishes to Arun and family ... you can find the presentation slides here.