That may have been the link for the Sun Certified
Java Architect, which doesn't exist anymore. Navigate a bit further and you'll find
http://suned.sun.com/US/certification/java/java_archj2ee.html That gives you a link to the
SCEA Success Guide PDF file, which everyone should read.
Sun has their EJB specs their web site, but it's a bit dry, so I personally just read the Monson-Haefel Enterprise JavaBeans book.