I was playing with JAXB for a while and i am very impressed with the technology. JAXB is trying to solve a real,hard problem for the developers. As everyone agrees, XML is a great technology to send data between 2 disparate applications but the challenge is to bind this data into the object space for the business processes. JAXB solves this problem nicely for the developers masking all the intricacies of XML.
I understood that JAX-RPC2.0 is using JAXB internally for the databinding and also the FastInfoset project in java.net.
If you are tired of all the hypes of XML, you might want to check out this one technology.