Okay, just gave it a try, and as I suspected:

Server Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/openerp/addons/web/common/http.py", line 592, in send
    result = openerp.netsvc.dispatch_rpc(service_name, method, args)
  File "/usr/lib/pymodules/python2.6/openerp/netsvc.py", line 360, in dispatch_rpc
    result = ExportService.getService(service_name).dispatch(method, params)
  File "/usr/lib/pymodules/python2.6/openerp/service/web_services.py", line 572, in dispatch
    res = fn(db, uid, *params)
  File "/usr/lib/pymodules/python2.6/openerp/osv/osv.py", line 167, in execute_kw
    return self.execute(db, uid, obj, method, *args, **kw or {})
  File "/usr/lib/pymodules/python2.6/openerp/osv/osv.py", line 121, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/lib/pymodules/python2.6/openerp/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/lib/pymodules/python2.6/openerp/osv/osv.py", line 164, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/usr/lib/pymodules/python2.6/openerp/addons/crm/wizard/crm_lead_to_opportunity.py", line 140, in action_apply
    self._convert_opportunity(cr, uid, ids, {'lead_ids': lead_ids}, context=context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/crm/wizard/crm_lead_to_opportunity.py", line 111, in _convert_opportunity
    partner_id = self._create_partner(cr, uid, ids, context=context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/crm_base_contact/wizard/crm_lead_to_opportunity.py", line 29, in _create_partner
    partner_ids = super(crm_lead2opportunity_partner, self)._create_partner(cr, uid, ids, context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/crm/wizard/crm_lead_to_partner.py", line 110, in _create_partner
    partner_ids = lead.convert_partner(cr, uid, lead_ids, data.action, partner_id, context=context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/crm/crm_lead.py", line 636, in convert_partner
    self._lead_create_partner_address(cr, uid, lead, partner_id, context=context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/crm_base_contact/crm_lead.py", line 77, in _lead_create_partner_address
    address_id = super(crm_lead, self)._lead_create_partner_address(self, cr, uid, partner_id, context=context)
  File "/usr/lib/pymodules/python2.6/openerp/addons/crm/crm_lead.py", line 608, in _lead_create_partner_address
    'name': lead.contact_name,
AttributeError: 'int' object has no attribute 'contact_name'

So no, calling the superclass _lead_create_partner_address won't help.

The diff:
=== modified file 'crm_base_contact/crm_lead.py'
--- crm_base_contact/crm_lead.py        2012-03-06 23:56:07 +0000
+++ crm_base_contact/crm_lead.py        2012-03-13 00:53:14 +0000
@@ -2,6 +2,7 @@
 ##############################################################################
 #
 #    OpenERP, Open Source Management Solution
+#    Copyright (C) 2012 VRT Systems (<http://www.vrt.com.au>).
 #    Copyright (C) 2004-2010 Tiny SPRL (<http://tiny.be>).
 #
 #    This program is free software: you can redistribute it and/or modify
@@ -73,25 +74,16 @@
                 })
 
     def _lead_create_partner_address(self, cr, uid, lead, partner_id, context=None):
+        address_id = super(crm_lead, self)._lead_create_partner_address(self, cr, uid, partner_id, context=context)
         location_id = self._lead_create_partner_location(cr, uid, lead, context=context)
         contact_id = self._lead_create_partner_contact(cr, uid, lead, context=context)
 
         address = self.pool.get('res.partner.address')
-        return address.create(cr, uid, {
-                    'partner_id': partner_id,
+        address.write(cr, uid, [address_id], {
                     'location_id': location_id,
                     'contact_id': contact_id,
-                    'phone': lead.phone,
-                    'email': lead.email_from and to_email(lead.email_from)[0],
-                    'fax': lead.fax,
-                    'function': lead.function,
-                    'street': lead.street,
-                    'street2': lead.street2,
-                    'zip': lead.zip,
-                    'city': lead.city,
-                    'country_id': lead.country_id and lead.country_id.id or False,
-                    'state_id': lead.state_id and lead.state_id.id or False,
                 })
+        return address_id
 
 crm_lead()