aop examples/docs:

http://forum.springsource.org/showpost.php?p=213252&postcount=9

http://static.springframework.org/spring/docs/2.5.x/reference/aop.html#aop-ataspectj-advice-params

others:

http://forum.springsource.org/showthread.php?t=30238
http://www.experts-exchange.com/Programming/Languages/Java/Q_21269825.html
http://jira.springframework.org/browse/SPR-3174
http://static.springframework.org/spring/docs/2.0.x/reference/xsd-config.html
http://www.springframework.org/schema/aop/spring-aop.xsd
http://forum.springsource.org/showthread.php?p=209424
http://www.javabeat.net/tips/85-how-to-write-interception-around-advice-in-sp.html
http://www.javalobby.org/java/forums/t44746.html
http://www.packtpub.com/article/design-with-spring-aop
http://static.springframework.org/spring/docs/2.5.x/reference/index.html
http://static.springframework.org/spring/docs/2.5.x/reference/aop.html#aop-schema
http://static.springframework.org/spring/docs/2.5.x/reference/aop-api.html
http://grails.org/doc/1.1/guide/14.%20Grails%20and%20Spring.html
http://www.zabada.com/technology/aop-example.html
http://www.infoq.com/articles/Orchestration-Oleg-Zhurakousky
http://www.jroller.com/kenwdelong/entry/circuit_breaker_in_java
http://static.springframework.org/spring/docs/2.0.x/api/org/springframework/aop/aspectj/AbstractAspectJAdvice.html
http://forum.springsource.org/showthread.php?t=62460