GlassFish refcard is available for download for free
In case that you are a glassfish administrator or a developer who uses glassfish in day to day development tasks then you will find GlassFish Reference Card a valuable source of information to keep you away from searching the web or administration references.
The reference card contains most important administration commands, security tips, performance tuning tips, clustering and monitoring instructions along with explanation around troube shooting and GlassFish directory structure.
Just navigate to http://refcardz.dzone.com/announcements/glassfish and download the reference card.
You can find many other refcardz in variety of topics at http://refcardz.dzone.com/