Web Service with PHP4 suggestions wanted.

Hello fellow PHP developers, I have recently fell upon the task of creating a Web Service. I have a web based application which also needs to be able to handle exchanging the result of the application back to the client, using a web service. Problem here is that I am currently still tied into PHP 4 and a migration to PHP 5 (which contains it's own SOAP library) is not possible in the nearest future. So I request some suggestions from any one that has experience with this on what web service library/extension you would chose with PHP 4 ? I read about nuSOAP but it seems they are not any longer maintaining the source ? since the last update was > 2 years ago. Thanks very much for your time, Mattias Hakansson