Architect Certification Preparation

Preparation guides

The concepts tested on the Java Architect exam are quite broad and cover a variety of topics. I've found the following books to be useful in my preparation:
Design Patterns book by Gamma, et. al.
UML distilled by Martin Fowler ( or any other book on UML)
Enterprise JavaBeans by Richard Monson-Haefel (or any other good EJB book)
The following white papers available at java.sun.com are useful too:
EJB
J2EE
Java Security
J2EE Blueprints
Some useful sites containing more pointers:
http://www.jguru.com/
http://www.jchq.net/
http://prasks.webahn.com/

Practice tests:
http://www.epractizelabs.com/blog2/?p=115