Hi there,
I've managed to get this up and running with the latest services (2.x) branch and nusoap installed.
For the most part the services are all working fine. However i've come across a problem when the input argument for a service method should be an object (xsd:struct). 2 examples of such are in node.save and user.save methods.

if i do a print_r() on the $soap_server object right after it has registered each service method with the soap server i get the following for user.save -

[user.save] => Array
                                        (
                                            [name] => user.save
                                            [binding] => DrupalSoapBinding
                                            [endpoint] => http://example.com/soap_server.php
                                            [soapAction] => urn:DrupalSoapuser.save
                                            [style] => rpc
                                            [input] => Array
                                                (
                                                    [use] => encoded
                                                    [namespace] => urn:DrupalSoap
                                                    [encodingStyle] => http://schemas.xmlsoap.org/soap/encoding/
                                                    [message] => user.saveRequest
                                                    [parts] => Array
                                                        (
                                                            [account] => xsd:struct
                                                        )
 
                                                )
 
                                            [output] => Array
                                                (
                                                    [use] => encoded
                                                    [namespace] => urn:DrupalSoap
                                                    [encodingStyle] => http://schemas.xmlsoap.org/soap/encoding/
                                                    [message] => user.saveResponse
                                                    [parts] => Array
                                                        (
                                                            [return] => xsd:int
                                                        )
 
                                                )
 
                                            [namespace] => urn:DrupalSoap
                                            [transport] => http://schemas.xmlsoap.org/soap/http
                                            [documentation] => Save user details.
                                        )

on first glance this looks all okay? However if i try and load the WSDL into soapUI to test the requests / responses the soap envelope looks like this - 

<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:DrupalSoap">
   <soapenv:Header/>
   <soapenv:Body>
      <urn:user.save soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>
   </soapenv:Body>
</soapenv:Envelope>

The envelope looks to be missing any kind of input parameters to post to the service ? Subsequently if i try to call the service posting it a user account object it simply returns 0 and does not save the user.
Any ideas how i can get the soap server to correctly accept object as an input parameter to the service?