I'm looking forward to this. I have two great rooms that may have a dozen active devices at any moment. I'm ok with the single-room applications for both of these common areas. I can imagine a lot of similar places in offices. Cubicles could have antanae attached or be made of a material that is more willing to reflect the beams; much easier than pulling wires.
If any of them are stationary, or mostly stationary, you might just want to run an ethernet cable. Even long ones are dirt cheap from Monoprice. For instance, I wired my iMac, my girlfriend's iMac, and leave a wire at our kitchen table, where laptops are most likely to be used, for about $12 shipped.
Transferring video files between machines is now fast, and we don't have interference from neighboring networks (or vice-versa). Ethernet also makes using distributed processing using Compressor (http://documentation.apple.com/en/compressor/usermanual/inde...) easy.