Newest book about JXTA

Hello, jxta developers!

I'm developing two P2P applications implemented in JXTA. One of my favourites
ways of learning is reading books, but my collection of pdf's and books about
JXTA is becoming out of date. I've read a pair of books from SAMS and Wrox, but
both of them were released on 2002.

What is the best "good" book published about jxta technology published during
the last 2 years?

Thank you very much, your help in this mailing list is very appreciated for me,
and has saved my a lot of problems during my implementation.

Joan