We decided to publish a further Spring 3.0 release candidate before going GA: Get it from the download page, do a round of thorough testing, and let us know how it works for you. Spring 3.0 is now waiting for your integration test feedback and will eventually go GA in mid December.
This release candidate comes with several enhancements: e.g. extended functionality in the new <mvc:*> namespace, and a further revision of startup/shutdown behavior (affecting message listeners and scheduled tasks). Feel free to give those features an early try! We are also keen to learn about upgrade experiences with existing Spring 2.5 applications since we expect many of your applications to selectively adopt 3.0 features… while keeping the majority of the code in its 2.5 shape for the time being.