I've made a "Jetspeed2 Seconda parte" (in Italian)
The example of migration, it's a portlet based on
Spring, MX4J and a three type of persistence,
JdbcClassic, JdbcTemplate(Spring) and JDO (JPOX with
JDO 2.0 features).
article here : http://www.jugsardegna.org/vqwiki/jsp/Wiki?Jetspeed2_I
or here http://www.mokabyte.it/2005/02/jetspeed2-2.htm
Then third part are available in march.
p.s. sorry for my bad english