Recently I was helping a customer figure out how to use an embedded WSDL with Flex’s WebService API. One scenario in which this is needed is when the actual WSDL is not available at runtime. In this case the application must contain the WSDL instead of request it at runtime. The Flex WebService API today only supports loading the WSDL over the network at runtime. Beginning in Flash Builder 4 the Service wizard generate code that internally use the WebService API.
Adobe TV has published a video I did recently about connecting Flex to a SOAP Webservice. Check it out and let me know what you think.