Sun Microsystems web site for this book (where you can find complete source code to all the examples in the book): http://java.sun.com/docs/books/jini/javaspaces
Sun Microsystems Java Distributed Computing web site: http://java.sun.com/products/javaspaces/
Sun Microsystems Jini technology page: http://www.sun.com/jini/
Sun Microsystems mailing list for discussion of the Javaspaces technology: http://archives.java.sun.com/archives/javaspaces-users.html