How many people with WP7 have you seen in the wild?
EDIT: In the wild = strangers.
For me, since October 2010 - 5 that I can recall. Nokiawise, I've seen a grand total of 1 Lumia 800 and 710 each.
The 710 sighting was the first WP7 sighting in months.
I commute quite often in the densest parts of London. I also do a lot of air commuting and I've seen a solitary Windows Phone while hanging around in airport lounges. It's not like I'm deliberately looking out for it all the time, but still...