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as for porting, if you've stayed within the J2EE spec it should not be very difficult. For config that goes outside the spec, you need to add jboss.xml deployment descriptors which are the JBoss specific parts. The DTD is under the docs/dtd dir, you should check it out to find the parts that match your weblogic config requirements.
I notice that WebSphere 5 has a new facility to take a WebLogic ear and convert everything necessary to run it straight away on WebSphere 5.
Sounds like JBoss could do with something similar.
there is one but I haven't used it so don't know how it works