I just downloaded the Springsource Tool Suite, and I created a simple bean configuration file called myDefinition.xml and placed it in the root directory of the Spring Project.
There currently (as of 2012-04-10) seem to be problems with the Spring Explorer view when using a purely annotation driven bean definition (i.e. using Java annotations to wire everything up instead of using XML files).
There is a workaround though, by providing a minimum XML file that declares scanning for components. http://forum.springsource.org/showthread.php?118928-Spring-Explorer-with-Java-based-Web-Container-configuration
Unfortunately, this procedure is still flawed, missing some components.