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Cloud service utilizes the network as a means to connect the user to resources that are based in the cloud. So one advantage of using the cloud, is the user can upload information to the cloud which will store that information for a later time. This is nice for easy access to files, and also freeing up memory for apps/software that isn't being used very often.
What I thought was most interesting, is how the general feel of what he was saying about RIM moving towards using a cloud service within the next couple years. I imagine that one of the first moves will be taking BBM and App World into the cloud using the BlackBerry ID.