http://www.jchq.net/essentials/full.htm
http://bobcat.webappcabaret.net/javachina/index.html
http://www.javaranch.com/maha/
http://www.jchq.net/certkey/index.htm
http://www.janeg.ca/scjp/language.html
http://www.javaranch.com/certfaq.jsp