I released a new version of JFC yesterday (after almost two years without a release) which have resulted in a couple of questions about what happened with the Bookends support I promised.
Well to make a long story short, two things happened: I've gotten very involved in using bibliographic software (that is writing papers) instead of just writing programs and I did a classic mistake as a programmer, see http://www.mootjelitt.se/node/30.
Anyway, since Bookends have moved on since I last touched the Bookends translator I need to rewrite parts of it. But it's on high on my list of things to fix.