Pluggable Java Persistence

Some great news coming out of Glassfish: their Java Persistence
implementation is now separately
downloadable and can be used in other environments, such
as Geronimo. Actually, it can be used in any J2SE
application. Also, other
Java Persistence implementations can be run in Glassfish. We
appear to have a pluggable persistence architecture for Java –
very nice!

I'm personally going to investigate using Java
Persistence in the browser, as a nicer (and more portable)
programmatic layer than JDBC for doing persistence in the browser.