To become certified you must take the official Spring course and pass the exam. The Live Online delivery method works well (they use WebEx) and is a little cheaper, especially if booked in advance.
I used the following resources to prepare for the exam:
* Re-read the training manual
* http://www.springsource.com/files/core-spring-3.0-certification-study-guide_0.pdf
http://springcert.sourceforge.net/
* http://knowledgeblackbelt.com/#!Exam/12904481
http://www.springcertification.co.uk/core-spring-certification-mock-test.php
http://www.javaranch.com/jeanne/Spring_3_Certification_Study_Notes.pdf
http://www.skill-guru.com/test/81/core-spring-certification-mock
Follow-up: I passed first time. I've starred the most useful resources above. Official advice is to re-do the lab work, but this isn't an efficient use of your time IMHO. The exam is not as tough as the Java Programmer, but you do need good Spring knowledge. I've been working with Spring for a number of years, but I doubt I would have passed without some revision. Know the Container, AOP and Transactions inside and out and you're well on your way. Good luck!
