I use JAXB at work all the time and I really love it. It's perfect for complex XML schemas that are always changing and especially good for random access of tags in an XML file.
I hate to pimp but I just started a blog and this is literally the first thing I posted about!
Check it out here:
http://arthur.gonigberg.com/2010/04/21/getting-started-with-jaxb/
