Why cloud roaming? As users get more and more accustomed to using various clouds for services, there will be a lot of services in a lot of clouds to keep track ofKind of like the ubiquitous CD shelves that grew everywhere before everything went online.
Soon, there will be a need for directory and single sign-on consolidation to make it as easy to get to your cloud-based services as it is to dial up a tune on your favorite MP3/4 player.