See http://www.jython.org/ for links to a substantial Jython tutorial from IBM's Barry Feigenbaum.
Also of note is that work on implementing new-style classes in Jython - key to the 2.2 release - is ongoing and Samuele Pedroni is aiming for a 15 November check-in of the new branch into sourceforge. Once we get that in, progress in Jython-land can proceed in multiple parallel-roads at once e.g. core language work, library work, build system work etc. etc.