I picked up an Airport Express while in Boulder.  The device is about as big as the power supply for my mac and seems to be the  perfect size, shape and weight for travelling. (The life of my original Airport shortened considerably on the one trip I brought it on).  Sadly, it turns out that I will not be able to use the 'Express' to extend my home network powered by my New d-Link WiFi router (explained succinctly in this FAQ). The D-link has an incredible range but I had visions of streaming iTunes to all sorts of remote locations throughout the house.  Playing with this device has led me to Apple pages on WDS.

Apple's Wireless Distribution System (WDS) looks pretty slick and would be an ideal solution for connecting sites that may be difficult to connect in other ways.  One interesting application would be to use the technology to create a mobile network linking together a small convoy of cars or trucks. Users with Macintoshes could make full use of Rendezvous, sharing resources (pictures, music, files) and even iChatting (adding video as needed) .  Presumably non Mac users could also benefit from this type of flexible, mobile and somewhat adhoc network.

This type of network does not rely on a connection to the internet* to be valuable - the value is in its ability to allow connections in places where they are normally difficult.  Enabling communications with those in close proximity is particularly valuable; the mobility of this network adds even more value.

*(If necessary, internet connectivity could be added to the network using a cell phone and GPRS).