I think the thing that surprised me the most was when my girlfriend's 12 year old daughter, who owns an iPod, picked up my Zune 80 and knew exactly what it was.
I think the proximity notification is all the more important given the sparse population of Zune owners. Sure you can congregate online, but how about the option to "socialize" in the real world if I choose too. I may not want to talk to the person, but I could then look them up by their Zune ID online when I get home.
Plus it would help give us poor Zune owners a feeling of solidarity.
