Yet another GlassFish podcast interview is out. This one is on OpenMQ and JMS. Several users have voted OpenMQ the GlassFish best kept secret (features, performance, & stability). The latest MQ 4.1 (integrated in GlassFish v2) has high-availability of both brokers and message stores.
Linda has a nice set posts on both JMS and the MQ open source product. In the interview, George also goes into topics such as the new SPECjms benchmark.
Bistro! 2.0 