Clemens Vasters just wrote about federated services in his blog. Sounds familiar? Of course. I spend a lot of time two years ago in investigating in Web Service Federations including soft- and hardware in my research at the IT-Management and Web Engineering Research Group (MWRG). At this time it was quite hard to explain to people what a Web Service federation actually is supposed to mean. We had a look deep into a couple of technologies. E.g., we allowed to connect uPnP devices with non-uPnP services across organizational boundaries, we used off-the-shelf Phidgets devices to control simulated Intel uPnP services. Unfortunately, WCF was not that stable at this time to use it as infrastructure for our approach even if we started to build upon it in the beginning.