With another new log from their IRC talk series, the PHP ThinkTank group has posted this new talk as given by Davey Shafik on the topic of web services.
The talk focuses mostly on the web service abilities of the Zend Framework (a module Davey helped with) and includes examples of things like XML-RPC connections and SOAP connections.
You can check out this and the logs from the other IRC talks the group has done on the group's website.