"Ultimately, to be successful, UPnP faces the same challenge Jini did: it needs a critical mass of devices shipping, which requires the industry to come together to create device and service specifications.? This seems to be happening:? On Friday the specifications by the AV working group (covering the specifications for media servers, media sinks and the transports between the two) were posted for 45 day review for forum members," says this article by Eric Freeman: