On the Ibuildings techPortal there's a new post with the latest episode in their DPCRadio series (as recorded at this past Dutch PHP Conference) - Melanie Rhianna Lewis' talk on web services and consumer devices.
A web service is an API provided by a site that allows a remote application to access data and use functionality without having to 'act like a web browser'. [...] The talk will describe how a web service targeted at consumer devices can be implemented. It will look at the different methods of calling remote functionality such as SOAP, XML-RPC, JSON and restful services. It will also consider the limitations of consumer devices, memory restrictions, communications bandwidth restrictions, and so on that have to be considered when designing a web service aimed at consumer devices. Finally it will have a brief look at how to make a service secure.