We are racing towards GlassFish v2 with the usual fine-tunings on performance and bug fixes, but also with usability improvements, as shown by these writeups by Byron:

•  The new model for getting Thread Dumps: it is automatic, works in native and non-native modes and with all 3 kinds of servers -- Domain Administration Servers, Node Agents and Server Instances.

•  How to use -verbose to easily get Logging Reporting in GlassFish.