You will not find a whole lot on Architect.
There are somes sites www.jawraski.com/java/certification
that has some UML, Legacy Connectivity, security questions.
and another one site xt_nt.com.
Off course there are ibm tests no 483 and 486 that have questions on UML and J2EE connectivity.
These test have different objectives than Sun's Architect exams, so some questions may be out of scope.
You may find some more sites here and there, but one word of caution, some answers may not be right.
Hope this helps