I've checked in code for these 2 jira tasks:

Spring integration quickstarts: http://jira.jboss.com/jira/browse/JBESB-367
For those too busy to read the Jira tickets, here's a quick rundown of the Spring quickstarts:
1. product/samples/quickstarts/spring_helloworld - simple loading/invoking of a spring bean
2. product/samples/quickstarts/spring_aop - simple SpringAOP example
3. product/samples/quickstarts/spring_jpetstore - more complicated Spring example that uses Spring managed DB connection pool/datasource, SpringTX, SpringAOP and iBatis for DB access.

Java class located at: product/core/listeners/src/org/jboss/soa/esb/actions/AbstractSpringAction.java that provides decent way to use Spring in the ESB:
http://jira.jboss.com/jira/browse/JBESB-592

There are unit tests for this code in: product/core/listeners/tests/src/org/jboss/soa/esb/actions/spring

If you're interested in Spring integration in the ESB, feel free to review and provide feedback.

James