March 31, 2000: This is probably obvious, but I think the biggest obstacle to widespread implementation of XML-RPC will be overcoming the business logic against openness of data. Most web app companies make all their money off the data they collect as people use their apps, right? So, if we can't protect this data, they will not open up their apps to remote procedure calls. I think the big reason RSS has been successful is that it specifically drives traffic to the originating site. So, can anyone make the business argument for opening data to XML-RPC?