[jboss-as7-dev] Anyone write up how to create your own data source on AS 7?

Has anyone written up how you create your own data source in AS 7 Beta 1? I'm trying to bring across my mysql-ds.xml into the configuration, but there are some tags that I don't understand (module stuff), and I'm also not sure about the carry over of things like transaction-isolation and connection-property tags. Andy