For the most part, the managed components we use can be found by looking at the plugin descriptor for the jboss-as-5 plugin:

http://git.fedorahosted.org/git/rhq/rht.git?p=rhq/rhq.git;a=blob;f=modules/plugins/jboss-as-5/src/main/resources/META-INF/rhq-plugin.xml;h=c50cd6b176b18a11aabfae54c6523e7dd0bdabf6;hb=master

Most resource types in the descriptor (i.e. server or service elements) map to a single ManagedComponent type, e.g. for Queues:

<service name="Queue"                
                 createDeletePolicy="both"
                 subCategory="JMS Destinations"
                 discovery="JmsDestinationDiscoveryComponent">
  
            <plugin-configuration>
                <c:simple-property name="componentType" default="JMSDestination" readOnly="true"/>
                <c:simple-property name="componentSubtype" default="Queue" readOnly="true"/>
...

So the Queue resource type maps to the JMSDestination:Queue ManagedComponent type. However, you'll notice there are exceptions, such as the JBoss AS Server resource type, which pull from multiple ManagedComponent types.