Sun contributes Glassfish + MySQL bundle in JEE download section at sun.com.
I had some problems with load balancing on glassfish clusters but today I got it up and running on my local machine using apache2 as web server.
Great article about the cache of Toplink Essetials(Glassfish JPA).
There is cool screencast about secure and reliable web service using metro and glassfish. It is here