See the download page for the promoted binary builds, source bundle, and a list of bugs that were fixed in this release.
The weekly promoted builds of GlassFish have passed a minimum level of testing. which includes the quicklook tests, a sub-set of CTS tests (representative collection of 418 J2EE 1.4 tests) and a sub-set of SQE tests (22 in number). A build is not promoted unless it passes quicklook, CTS smoke and SQE smoke tests.
GlassFish is a free, open source application server which implements the newest features in the Java EE 5 platform (the next version of the J2EE platform). The Java EE 5 platform includes the latest versions of technologies such as Enterprise JavaBeans (EJB) 3.0, JavaServer Faces (JSF) 1.2, Servlet 2.5, JavaServer Pages (JSP) 2.1, Java API for Web Services (JAX-WS) 2.0, Java Architecture for XML Binding (JAXB) 2.0, Java Persistence 1.0, Common Annotations 1.0, Streaming API for XML (StAX) 1.0, and many other new technologies.