I agree that having to “pour” files from one device to another might not be ideal if the files take long to transfer, but I understood that the pouring gesture would just initiate the transfer and the device could then be laid to rest for the transfer to be completed.

Controlling the connections and interactions with other devices on the range is an interesting design problem. What is the best way to control how the PMP talks to others around it, with the computer it might be synced with or even peripherials like loudspeakers etc.? This is a big issue and I think the pouring-gesture is a good idea for this, but of course just the beginning.

Detecting the direction or at least proximity of other wireless / bluetooth -enabled devices in range needs to be translated to graphical representation so that the user is aware of the affordances of the situation. Then, having an intuitive way to contol the possible interactions (transfer files to another device, sync with the media library on a computer, stream content to media centre or play music through BT headphones etc.) is what can really distinguish one device from the mass of PMP’s out there.

Think about “sweep to stream”: make a large sweeping-like motion to start streaming the music to the space around you using the media center in the room. Or “zigzag to sync”, click open the icon of computer on the PMP screen and make a quick forward-back movement to synchronise the medial libraries. Etc.